Thermal and wear resistant tough nickel based alloy guide rolls

ABSTRACT

This invention relates to the thermal and wear resistant, tough alloy at elevated temperatures. The alloy consists essentially of carbon, chromium, iron, titanium, aluminum, tungsten, molybdenum, silicon, manganese, cobalt and balance nickel, further the alloy includes optionally at least one selected from the group consisting of nitrogen, niobium and tantalum, further the alloy includes optionally at least one selected from the group consisting of nitrogen, niobium and tantalum, further the alloy includes optionally at least one selected from the group consisting of boron and zirconium. The alloy according to this invention are widely utilized to serve as the alloy for build-up weld and for guide shoe used in the hot rolling apparatus for fabricating seamless steel pipe.

This is a continuation of application Ser. No. 498,208, filed May 4,1983, which was abandoned upon the filing hereof.

FIELD OF THE INVENTION

This invention relates to the thermal and wear resistant, tough alloy atelevated temperatures.

The alloy consists essentially of carbon, chromium, iron, tungsten,molybdenum, titanium, aluminum, silicon, manganese, cobalt and nickel,and the alloy further include optionally nitrogen, and at least oneselected from the group consisting of niobium, tantalum and the alloyfurther include optionally at least one selected from the groupconsisting of boron, zirconium. The alloys of this invention relate toalloys for many application that can be used for providing the build-upwelding and for providing the guide shoe for use a hot rolling apparatusfor fabricating seamless steel pipes.

BACKGROUND OF THE INVENTION

Generally, a hot rolling apparatus for fabricating seamless steel pipescomprises a pair of upper and lower tapered rolls of a barrel shapedisposed in intersecting relation to each other, opposed guide shoesdisposed on opposite sides of center axes of the tapered barrel rollsand spearhead shaped plug disposed intermediate the tapered barrel rollsin front thereof. A round billet heated at temperature of 1150 to 1250°C. is supplied to the hot rolling apparatus of the tapered roll type.The round billet in hot pierced at its center by the plug while it isbeing rotated by the tapered barrel rolls. Thereafter, the piercedbillet is rolled repeatedly and formed into a seamless steel pipe. Inthis case, during the fabrication of the pipe, it assumes an ellipticalshape due to compressive force and projective force exerted by thetapered barrel rolls. The guide shoes are arranged 90 degreescircumferentially of each roll in opposed relation to each other so asto control the outer shape and the thickness of the pipe. Therefore, theguide shoes are in contact with the steel pipe heated at elevatedtemperatures, so that the surface of the guide shoes are held in slidingcontact with the rotatingly advancing steel pipes.

As a result, the guide shoes are repeatedly subjected to a rapid heatingat elevated temperatures and a rapid cooling by cooling water. Further,the guide shoes undergo rolling sliding friction under greated stressload.

The guide shoes conventionally used under such serve conditions are madeof a material such as an alloy consisting of 26% by weight ofchromium--3% by weight of nickel--the balance iron alloy, 26% by weightof chromium--2% by weight of nickel--the balance iron alloy havingthermal and wear resistant steel alloy at elevated temperatures, 1% byweight of carbon 5% by weight of copper--the balance iron alloy and 1%by weight of carbon--15% by weight of chromium--5% by weight ofmolybdenum--the balance nickel alloy. Some of these alloys affect ayield to fabricate a seamless steel pipe because of insufficientcorrosion resistance at elevated temperatures. Scales or steel piecesformed at the surface of the steel pipe heated at elevated temperaturesare stuck to the surface of the guide shoes by the heat involved. Thestuck scales or steel pieces of the guide shoes give rise to damage tothe surface thereby affecting the yield rate of the fabrication of thesteel pipe. Also some of conventional alloys cannot withstand a thermalshock due to repeated of local heating and water cooling. As a result,cracks are formed on the surface of the guide shoe, so that subjected todamage.

Further some of these conventional alloys are not sufficient in wearresistance. Guide shoe made of such alloy has a shorter service life.

After an extensive study to provide an alloy which are sufficient inthermal resistance, wear resistance, toughness and hardness for use asguide shoes for a hot rolling apparatus of the tapered roller type forfabricating seamless steel pipe, this invention is achieved.

DISCLOSURE OF THE INVENTION

An object of this invention is to provided alloys having thermalshockproof, thermal and wear resistance, and corrosion resistance atelevated temperatures.

Another object of this invention is to provided such alloys for use asguide shoes for hot rolling apparatus of the tapered roller type forfabricating seamless steel pipe.

The alloy of this invention comprises 0.55 to 2.0 percent by weight ofcarbon, 10 to 28% by weight of chromium, 1 to 30% by weight of iron,0.01 to 4.5% by weight of titanium, 0.01 to 4.5% by weight of aluminium,0.1 to 10% by weight of tungsten, 0.1 to 10%, by weight of molybdenium,the balance nickel and incidental impurity, the alloy includingoptionally 0.1 to 3% by weight of silicon, 0.1 to 3% by weight ofmanganese, 1 to 8% by weight of cobalt, the alloy including optionallyat least one selected from the group consisting of 0.005 to 0.2% byweight of nitrogen, 0.01 to 1.5% by weight of niobium and tantalum andthe alloy including optionally at least one selected from the groupconsisting of 0.001 to 0.2% by weight of boron and zirconium.

The invention will now be more specifically described.

A thermal and wear resistant, tough alloy according to a firstembodiment of this invention consists essentially of 0.55 to 2.0% byweight of carbon, 10 to 28% by weight of chronium, 1 to 30% by weight ofiron, 0.01 to 4.5% by weight of titanium, 0.01 to 4.5% by weight ofaluminium, 0.1 to 10% by weight of tungsten, 0.1 to 10% by weight ofmolybdenium, the balance nickel and incidental impurities, the alloyfurther including optionally 0.1 to 3% by weight of silicon, 0.1 to 3%by weight of manganese, the alloy further including optionally at leastone selected from the group consisting of 0.005 to 0.2% by weight ofnitrogen, 0.01 to 1.5% by weight of niobium and tantalum, the alloyfurther including optionally at least one selected from the groupconsisting of 0.001 to 0.2% by weight of boron and zirconium.

Furthermore, a thermal and wear resistant, tough alloy according to asecond embodiment of this invention consists essentially of 0.55 to 2.0%by weight of carbon, 10 to 28% by weight of chromium, 1 to 30% by weightof iron, 0.01 to 4.5% by weight of titanium, 0.01 to 4.5% by weight ofaluminium, 0.1 to 10% by weight of tungsten, 0.1 to 10% by weight ofmolybdenum, 1 to 8% by weight of cobalt, the balance nickel andincidental impurities, the alloy further including optionally 0.1 to 3%by weight of silicon, 0.1 to 3% by weight of manganese, the alloyfurther including optionally at least one selected from the groupconsisting of 0.005 to 0.2% by weight of nitrogen, 0.01 to 1.5% byweight of niobium and tantalum, and the alloy further includingoptionally at least one selected from the group consisting of 0.001 to0.2% by weight of boron and zirconium.

Furthermore a thermal and wear resistant, tough alloy according to thirdembodiment of this invention consists essentially of 0.55 to 2.0% byweight of carbon, 10 to 28% by weight of chromium, 3 to 30% by weight ofiron, 0.01 to 3.5% by weight of titanium, 0.01 to 3.5% by weight ofaluminium, 0.5 to 10% by weight of tungsten, 0.1 to 10% by weight ofmolybdenum, 0.1 to 3% by weight of silicon, 0.1 to 3% by weight ofmanganese, the balance nickel and incidental impurities, the alloyfurther including optionally at least one selected from the groupconsisting of 0.005 to 0.2% by weight of nitrogen, 0.01 to 1.5% byweight of niobium and tantalum, the alloy further including optionallyat least one selected from the group consisting of 0.001 to 0.2% byweight of boron and zirconium. Furthermore, a thermal and wearresistant, tough alloy according to a fourth embodiment of thisinvention consists essentially of 0.55 to 2.0% by weight of carbon, 10to 28% by weight of chromium, 3 to 30% by weight of iron, 0.01 to 3.5%by weight of titanium, 0.01 to 3.5% by weight of aluminium, 0.5 to 10%by weight of tungsten, 0.5 to 10% by weight of molybdenum, 0.1 to 3% byweight of silicon, 0.1 to 3% by weight of manganese, 1 to 8% by weightof cobalt, the balance nickel and incidental impurities, the alloyfurther including optionally at least one selected from the groupconsisting of 0.005 to 0.2% by weight of nitrogen, 0.01 to 1.5% byweight of niobium and tantalum, the alloy further including optionallyat least one selected from the group consisting of 0.001 to 0.2% byweight of boron and zirconium.

THE PREFERRED EMBODIMENTS OF THE INVENTION

The effect of the components of the thermal and wear resistant, toughalloy at elevated temperatures according to the invention and the reasonwhy the component have specified contents will now be described.

Carbon: Carbon is dissolved into an alloy matrix at elevatedtemperatures. Carbon also reacts with chromium, tungsten, molybdenum,titanium, niobium, tantalum and so on to form carbides such as M₇ C₃, MCand M₂₃ C₆ so that the resultant alloy is improved in the strength andthe hardness. Therefore, carbon content serves to impact an excellentwear resistance to the alloy and also imparts the weldability and thecastability to the alloy. When the carbon content is below 0.55% byweight, the alloy fails to have the abovementioned properties. On theother hand, when the carbon content exceeds 2.0% by weight, theresultant alloy has an increased amount of deposition of carbides, andalso a particle size of the carbides becomes larger to lower thetoughness of the alloy so that the alloy can not withstand a thermalshock due to the rapid heating and cooling. Therefore, it is determinedthat the carbon content should be 0.55 to 2.0% by weight.

Chromium: Chromium is dissolved into an alloy matrix in parts and theremainder reacts with carbon to form carbides. The resultant alloy isimproved in the wear resistance and the hardness at elevatedtemperatures. Chromium serves to impart the corrosion resistance atelevated temperatures. When chromium content is below 10% by weight, thealloy fails to have the abovementioned properties. When chromium contentexceeds 28% by weight, the alloy has a decreased amount of the thermalshock resistance. Therefore, it is determined that chromium contentshould be 10 to 28% by weight.

Iron: Iron is dissolve into an alloy matrix and enhance the thermalshock resistance and the toughness. Iron is added as the alternative tothe expensive nickel component in view of the cost. When iron contentsare below 1% by weight, the resultant alloy have not sufficiently theeconomical use. When iron contents exceed 30% by weight, the resultantalloy is deteriorated the strength at elevated temperature. Therefore,it is determined that iron content should be 1 to 30% by weight,furthermore preferably 3 to 30% by weight.

Titanium: Titanium not only suppresses a growth of a crystal grain inthe alloy matrix but atomize preferably the crystal grain. Titaniumreacts with carbon and nitrogen to form MC type carbide and nitride,further reacts with nickel and aluminium to form the intermetalliccompound such as abovementioned {Ni₃ (Al, Ti)}. The resultant alloy isimproved in the strength and the wear resistance at elevatedtemperatures. When the titanium content is below 0.01% by weight, thealloy fails to have the abovementioned properties. When the titaniumcontent exceeds 4.5% by weight, the resultant alloy is deteriorated inthe toughness of the alloy due to accelerate the formation of carbide atelevated temperatures and further deteriorated the corrosion resistanceat elevated temperature due to proceed remarkably the formation oxide atelevated temperatures. Therefore, it is determined that the titaniumcontent should be 0.01 to 4.5% by weight, furthermore preferably 0.01 to3.5% by weight.

Aluminium: The alloy is improved by the addition of aluminium theoxidation resistance and the corrosion resistance at elevatedtemperatures in the coexistence of chromium. As abovementioned,aluminium reacts with nickel and titanium to from the intermetalliccompound such as {Ni₃ (Al, Ti)}and further reacts with nitrogen to formnitride. The resultant is improved in the strength and the wearresistance at elevated temperatures and improved in the thermal shockresistance and the toughness. When the aluminium content is below 0.01%by weight, the alloy fails to have the abovementioned properties. Whenthe aluminium content exceeds 4.5% by weight, the resultant alloy showsthe decrease of the fluidity and the castability in the melt, as aresult, the resultant alloy not only becomes difficulty the productionin the casting but cannot make use of the production in practice becauseof the deterioration of the toughness and the weldability. Therefore, itis determined that the aluminium content should be 0.01 to 4.5% byweight, furthermore preferably, 0.01 to 3.5% by weight.

Tungsten: Tungsten is dissolved into an alloy matrix. Tungsten alsoreacts with carbon to form a carbide. The resultant alloy is improved inthe hardness and the wear resistance at elevated temperatures. Whentungsten content is below 0.1% by weight, the resultant alloy fails tohave the abovementioned properties. When the tungsten content exceeds10% by weight, the resultant alloy is improved the wear resistance, butalso is deteriorated the toughness and the thermal shock. Therefore, itis determined that the tungsten content should be 0.1 to 10% by weight,furthermore preferably 0.5 to 10% by weight.

Molybdenum: The alloy is improved by the addition of molybdenum the wearresistance at elevated temperatures similar to tungsten component. Whenmolybdenum content is below 0.1% by weight, the resultant alloy fails tohave the abovementioned properties. When the molybdenum content exceeds10% by weight, the resultant alloy is deteriorated the toughness and thethermal shock resistance. Therefore, it is determined that themolybdenum content should be 0.1 to 10% by weight, furthermorepreferably 0.5 to 10% by weight.

Silicon: The alloy is improved by the additon of silicon the thermalresistance, the deoxidation effect and the fluidity of the melt similarto chromium. The resistant alloy is improved in the castability and thestrength at elevated temperatures. When the silicon content is below0.1% by weight, the resultant alloy fails to have the abovementionedproperties. When the silicon content exceeds 3% by weight, the resultantalloy is deteriorated the toughness and the weldability in the relationof chromium component. Therefore, it is determined that the siliconcontent should be 0.1 to 3% by weight. When silicon is used as thedeoxidation agent, however, silicon includes below 0.1% by weight of theincidental impurities. It is suitable in this case that the siliconincluded with the incidental impurities is added over 0.1% by weight.

Manganese: Manganese is dissolved into the alloy matrix to stabilize theaustenite matrix. The resultant alloy is improved in the thermal shockresistance and the wear resistance at elevated temperatures and theeffect of the deoxidation. When the manganese content is below 0.1%weight, the resultant alloy fails to have the abovementioned properties.When the manganese content exceeds 3% by weight, the resultant alloy isdeteriorated the corrosion resistance at elevated temperatures.Therefore, it is determined that the manganese content should be 0.1 to3% by weight. Manganese component similar to silicon component includesbelow 0.1% by weight of the incidental impurities. It is suitable inthis case that the manganese included with the incidental impurities isadded over 0.1% by weight.

Cobalt: Cobalt is dissolved into the austenite matrix to improve thestrength at elevated temperatures. The resultant alloy is improved inthe wear resistance and the thermal shock resistance at elevatedtemperatures. When the cobalt content is below 1% by weight, theresultant alloy fails to have the abovementioned properties. When thecobalt content exceeds 8% by weight, the resultant alloy does not showmore effective improvement but rather than shows the decrease of theabovementioned properties. Therefore, it is determined that the cobaltcontent should be 1 to 8% by weight.

Nitrogen: Nitrogen is dissolved into the austenite matrix to stabilizethe alloy. Nitrogen also reacts with a metal component to form thenitride of the metal. The resultant alloy is improved in the strength atelevated temperatures. When the resultant alloy is required to have thestrength at elevated temperatures, the nitrogen component is includedoptionally in the alloy. When the nitrogen content is below 0.005% byweight, the resultant alloy does not improve in more effective strengthat elevated temperatures. When the nitrogen content exceeds 0.2% byweight, the resultant alloy not only has an increased amount of nitridebut has a gross particle of the nitride. The resultant alloy is abrittle alloy and is deteriorated in the thermal shock resistance.Therefore, it is determined that the nitrogen content should be 0.005 to0.2% by weight.

Niobium and tantalum: The alloy is suppressed by the addition of thesecomponent specially to the growth of the crystal in the alloy matrix.These component also react with carbon and nitrogen to form the MC typecarbide and the nitride. The resultant alloy is improved in the strengthand the wear resistance at elevated temperatures, also improved morehomogenized action. When the resultant alloy is required to have theabovementioned properties, niobium and tantalum is added optionally intothe alloy. When niobium and tantalum content are below 0.01% by weight,the resultant alloy fails to have the abovementioned properties. Whenniobium and tantalum content exceed 1.5% by weight, the resistant alloyis deteriorated in the corrosion resistance due to increase the growthof the oxide at elevated temperatures and furthermore deteriorated thetoughness and the wear resistance due to increase extraordinarily theformation of the carbide. Therefore, it is determined that niobium andtantalum content should be 0.01 to 1.5% by weight.

Boron and zirconium: The alloy is improved by the addition of thesecomponent the homogenized action and the strength, the wear resistance,the thermal shock resistance and the corrosion resistant at elevatedtemperatures. When boron and zirconium contents are below 0.001% byweight, the resultant alloy fail to have the abovementioned properties.When boron and zirconium contents exceed 0.2% by weight, the resultantalloy is deteriorated in the toughness, the thermal shock resistance,the castability and the weldability. Therefore, it is determined thatboron and zirconium content should be 0.001 to 0.2% by weight.

Nickel: Nickel in included as remainder in the alloy of this invention.Nickel is dissolved into an alloy matrix to stabilize austenite matrixand enhance the thermal shock resistance and the toughness. On the otherhand, nickel reacts with aluminium and titanium to form an intermetalliccompound such as {Ni₃ (Al. Ti)}, furthermore the resultant alloy isimproved in the strength and the wear resistance at elevatedtemperatures similar to chromium.

Each metal components are weighted and heated by the usual highfrequency melting furnace under atmospheric pressure at 1400 to 1700° C.for 20 to 30 min. to form the melt. The melt is casted into the sandmold and the casted alloy is prepared each of the test piece for thetest. These test piece are used for the many test, such as the hardness,the impact resistance at room temperature, the thermal shock resistanceand the wear resistance. The thermal shock resistance test is carriedout by the repetition of the rapid heating and the rapid cooling undernearly conditions of the practical machine.

The hardness test is carried out by the measurement of Vickers hardnessat room temperature, at 900° C. and at 1000° C. The Ohgoshi typeintermetallic wear resistance test is carried out under the load of 18.2kg, the wear velocity of 0.083 m/sec. at room temperature in the drycondition. The opposited metal having over 57 of Rockwell hardness(H_(R) C) of the metal such as SUJ-2 is used in this test. The amount ofthe specific wear is estimated by the measurement of the wear resistanceto the test piece. Furthermore, the test piece used for thermal shockresistance test is prepared to form in rectangular pillar shape of 12mm×12 mm×30 mm having the recess of the spherical surface at the centerof the pillar end. The thermal shock test comprises to repeating a cyclewhich the test piece is heated by oxygen-propane gas burner to hold atabout 900° C. at the recess of the spherical surface for 30 sec. andthereafter are cooled at once by blowing off with the water spray tohold at about 200° C. at the recess of the spherical surface. This cycleare carried out repeatly and at every three time the test piece isobserved the detection of the crack by the fluorecence permeation at therecess of the spherical surface and measured the occurrence of thecrack. If the number of the cycle which the crack occurred at the testpiece is over 30, the notation of the thermal shock resistance refersto >30 in the TABLE as follows. In other words, it is meant that thenotation of >30 does not are observed the occurrence of the crack at therecess of the spherical surface till the repetition of thermal shockresistance test of 30 times.

The composition and the properties of comparative alloy are showed tocompare with the thermal and resistant, tough alloy at elevatedtemperatures according to this invention in the TABLE. The content ofthe component put on asteristic sign at the shoulder of the numeral incomparative alloy are showed to have a different composition contentfrom the scope of the alloy according to this invention. Furthermore,the alloy of prior art are showed in the relation with the alloy of thisinvention. The percentage of content refers to the percentage by weightas follow.

EXAMPLE 1 C-Cr-Fe-W-Mo-Ti-Al-Ni ALLOY As are shown in TABLE 1-1, TABLE1-2, TABLE 1-3, and TABLE 1-4, each metal component is weighted, addedto mixing, and heated by the usual high frequency melting furnace underthe atmosphere to form the melt and thereafter the melt is casted intothe said mold to prepare the casting.

The composition of Nos. 1 to 15 show C-Cr-Fe-W-Mo-Ti-Al-Ni base alloyaccording to this invention. Furthermore, Nos. 16 to 18 show theabovementioned alloy included silicon and Nos. 19 to 21 show the alloyincluded manganese and Nos. 22 to 23 show the alloy included nitrogen.Nos. 24 to 57 also show the abovementioned alloy including optionally atleast one selected from the group consisting of silicon, manganese,nitrogen, niobium, tantalum, boron and zirconium.

The comparative alloy of Nos. 58 to 70 show to include the content ofthe composition that the content were without the scope of thisinvention according to C-Cr-Fe-W-Mo-Ti-Al-Ni alloy. Furthermore, theprior art alloy of Nos. 71 to 72 show to include the content of thecomposition.

As are shown in TABLE 2-1, TABLE 2-2, and TABLE 2-3, the results of theproperties of the alloy is shown each Vickers hardness at roomtemperature, at 900° C., and at 1000° C., furthermore Charpy impactstrength at room temperature, the amount of the specific wear, and thenumber of the cycle till the occurrence of the crack.

No. 8 in TABLE 1 consists essentially of 0.98% by weight of carbon,15.53% of chromium, 17.87% of iron, 0.11 of tungsten, 8.75% ofmolybdenum, 0.64% of titanium, 0.62% of aluminium and the balance nickel(% refers to percent by weight). The properties of No. 8 alloy is shownin TABLE 2-1. For example, No. 8 alloy show 365 of Vickers hardness atroom temperature, 231 at 900° C., 172 at 1000° C., and 1.46 kg-m/cm² ofCharpy impact strength, 1.32×10⁻⁷ of the amount of the specificwear, >30 of the number of the cycle till the occurrence of the crack.

The comparative alloy of No. 62 consists essentially of 1.08% by weightof carbon, 20.18% of chromium, 31.91% of iron, 0.02% of titanium, 1.62%of aluminium, 9.01% of tungsten, 2.01% of molybdenum and the balancenickel (% refers to percent by weight). This No. 62 showed >30 as thenumber of the cycle till the occurrence of the crack in TABLE 2-3. TheNo. 62 also is shown 2.84×10⁻⁷ of the amount of the specific wear, 2.83kg-m/cm² of Charpy impact strength at room temperature, 294 of Vickershardness at room temperature, 133 at 900° C., and 110 at 1000° C.

The prior art alloy No. 72 consists essentially of 1.28% by weight ofcarbon, 33.92% of chromium, 17.89% of iron, 3.06% of tungsten, 2.98% ofmolybdenum, 4.98% of copper and the balance nickel (% refers to percentby weight). This No. 72 alloy showed 3 as the number of the cycle tillthe occurrence of the crack, 1.97×10⁻⁷ of the amount of the specificwear, 0.43 kg-m/cm² Charpy impact strength at room temperature, 305 ofVickers hardness at room temperature, 143 at 900° C., and 130 at 1000°C.

These alloys are shown the content of the composition and the propertiesof the alloy in TABLE 1-1, TABLE 1-2, TABLE 1-3, TABLE 1-4 and TABLE2-1, TABLE 2-2, TABLE 2-3, respectively.

                                      TABLE 1                                     __________________________________________________________________________           COMPONENT OF COMPOSITION (% by weight)                                        C   Cr Fe  W   Mo  Ti  Al  Si Mn N  Nb  Ta  B   Zr   Ni                __________________________________________________________________________    ALLOY                                                       ←            OF THIS                                                                       INVENTION                                                                      1     0.58                                                                              20.11                                                                            26.96                                                                             4.94                                                                              5.06                                                                              1.54                                                                              0.12                                                                              -- -- -- --  --  --  --   bal.               2     1.34                                                                              20.12                                                                            26.98                                                                             4.95                                                                              5.04                                                                              1.52                                                                              0.14                                                                              -- -- -- --  --  --  --   bal.               3     1.97                                                                              20.10                                                                            26.97                                                                             4.97                                                                              5.03                                                                              1.52                                                                              0.11                                                                              -- -- -- --  --  --  --   bal.               4     0.86                                                                              10.5                                                                             18.01                                                                             5.96                                                                              4.58                                                                              1.55                                                                              0.06                                                                              -- -- -- --  --  --  --   bal.               5     0.83                                                                              27.3                                                                             18.03                                                                             5.93                                                                              4.55                                                                              1.57                                                                              0.03                                                                              -- -- -- --  --  --  --   bal.               6     1.05                                                                              20.20                                                                            1.2 8.94                                                                              2.00                                                                              0.04                                                                              1.51                                                                              -- -- -- --  --  --  --   bal.               7     1.07                                                                              20.21                                                                            29.7                                                                              8.98                                                                              2.04                                                                              0.03                                                                              1.60                                                                              -- -- -- --  --  --  --   bal.               8     0.98                                                                              15.53                                                                            17.87                                                                             0.11                                                                              8.75                                                                              0.64                                                                              0.62                                                                              -- -- -- --  --  --  --   bal.               9     0.97                                                                              15.54                                                                            17.86                                                                             9.87                                                                              2.19                                                                              0.65                                                                              0.64                                                                              -- -- -- --  --  --  --   bal.              10     1.02                                                                              15.55                                                                            17.88                                                                             8.79                                                                              0.11                                                                              0.63                                                                              0.65                                                                              -- -- -- --  --  --  --   bal.              11     1.03                                                                              15.57                                                                            17.90                                                                             1.56                                                                              9.93                                                                              0.62                                                                              0.63                                                                              -- -- -- --  --  --  --   bal.              12     0.92                                                                              20.08                                                                            18.03                                                                             6.06                                                                              3.04                                                                               0.012                                                                            3.57                                                                              -- -- -- --  --  --  --   bal.              13     0.89                                                                              20.05                                                                            18.00                                                                             6.01                                                                              3.01                                                                              4.47                                                                               0.015                                                                            -- -- -- --  --  --  --   bal.              14     0.93                                                                              20.04                                                                            18.03                                                                             5.03                                                                              4.06                                                                              3.30                                                                               0.011                                                                            -- -- -- --  --  --  --   bal.              15     0.90                                                                              20.01                                                                            18.04                                                                             5.05                                                                              4.03                                                                               0.014                                                                            4.45                                                                              -- -- -- --  --  --  --   bal.              16     0.99                                                                              15.20                                                                            18.06                                                                             5.21                                                                              3.07                                                                              1.39                                                                              0.10                                                                              0.11                                                                             -- -- --  --  --  --   bal.              17     1.00                                                                              15.18                                                                            18.03                                                                             5.18                                                                              3.04                                                                              1.40                                                                              0.09                                                                              1.49                                                                             -- -- --  --  --  --   bal.              18     0.96                                                                              15.16                                                                            18.00                                                                             5.20                                                                              3.01                                                                              1.38                                                                              0.10                                                                              2.94                                                                             -- -- --  --  --  --   bal.              19     1.00                                                                              25.10                                                                            7.90                                                                              6.76                                                                              3.22                                                                              0.10                                                                              1.05                                                                              -- 0.12                                                                             -- --  --  --  --   bal.              20     0.97                                                                              25.09                                                                            7.88                                                                              6.78                                                                              3.24                                                                              0.12                                                                              1.03                                                                              -- 1.48                                                                             -- --  --  --  --   bal.              21     0.98                                                                              25.11                                                                            7.87                                                                              6.77                                                                              3.22                                                                              0.10                                                                              1.03                                                                              -- 2.98                                                                             -- --  --  --  --   bal.              22     1.24                                                                              15.03                                                                            10.04                                                                             5.00                                                                              4.99                                                                              0.60                                                                              0.14                                                                              0.81                                                                             -- 0.084                                                                            --  --  --  --   bal.              23     1.22                                                                              15.04                                                                            10.01                                                                             5.02                                                                              4.97                                                                              0.59                                                                              0.13                                                                              -- 0.74                                                                             0.059                                                                            --  --  --  --   bal.              24     1.00                                                                              20.06                                                                            18.06                                                                             6.04                                                                              3.00                                                                              2.03                                                                              0.97                                                                              -- -- --  0.012                                                                            --  --  --   bal.              25     0.99                                                                              20.05                                                                            18.07                                                                             6.02                                                                              3.03                                                                              2.04                                                                              0.98                                                                              -- -- -- 0.96                                                                              --  --  --   bal.              26     0.98                                                                              20.02                                                                            18.06                                                                             6.03                                                                              3.01                                                                              2.02                                                                              0.96                                                                              -- -- -- 1.47                                                                              --  --  --   bal.              27     0.96                                                                              20.00                                                                            18.07                                                                             6.06                                                                              3.03                                                                              2.01                                                                              0.98                                                                              -- -- -- --   0.013                                                                            --  --   bal.              28     0.98                                                                              20.05                                                                            18.06                                                                             6.03                                                                              3.08                                                                              2.00                                                                              0.96                                                                              -- -- -- --  0.99                                                                              --  --   bal.              29     0.96                                                                              20.07                                                                            18.03                                                                             6.01                                                                              3.05                                                                              2.03                                                                              0.97                                                                              -- -- -- --  1.49                                                                              --  --   bal.              30     0.98                                                                              20.06                                                                            18.05                                                                             6.04                                                                              3.06                                                                              2.04                                                                              0.94                                                                              -- -- -- 0.40                                                                              0.41                                                                              --  --   bal.              31     0.99                                                                              20.06                                                                            18.07                                                                             6.09                                                                              3.04                                                                              2.06                                                                              0.92                                                                              0.51                                                                             -- -- 0.96                                                                              --  --  --   bal.              32     0.96                                                                              20.09                                                                            18.03                                                                             6.07                                                                              3.02                                                                              2.04                                                                              0.95                                                                              0.55                                                                             -- -- --  0.93                                                                              --  --   bal.              33     0.98                                                                              20.11                                                                            18.04                                                                             6.01                                                                              3.03                                                                              2.01                                                                              0.97                                                                              -- 0.84                                                                             -- 0.06                                                                              --  --  --   bal.              34     0.96                                                                              20.12                                                                            18.06                                                                             6.04                                                                              3.07                                                                              2.05                                                                              0.97                                                                              -- 0.83                                                                             -- --  0.05                                                                              --  --   bal.              35     0.99                                                                              20.09                                                                            18.05                                                                             6.05                                                                              3.04                                                                              2.02                                                                              0.98                                                                              0.66                                                                             -- -- 0.35                                                                              0.36                                                                              --  --   bal.              36     0.96                                                                              20.10                                                                            18.05                                                                             5.01                                                                              4.05                                                                              0.90                                                                              1.99                                                                              -- -- -- --  --   0.0011                                                                           --   bal.              37     0.97                                                                              20.09                                                                            18.07                                                                             5.04                                                                              4.04                                                                              0.91                                                                              1.97                                                                              -- -- -- --  --  0.102                                                                             --   bal.              38     0.96                                                                              20.07                                                                            18.05                                                                             5.03                                                                              4.03                                                                              0.93                                                                              1.98                                                                              -- -- -- --  --  0.197                                                                             --   bal.              39     0.98                                                                              20.13                                                                            18.17                                                                             5.14                                                                              4.15                                                                              1.05                                                                              2.06                                                                              -- -- -- --  --  --   0.0012                                                                            bal.              40     0.97                                                                              20.15                                                                            18.14                                                                             5.13                                                                              4.12                                                                              1.06                                                                              2.02                                                                              -- -- -- --  --  --  0.098                                                                              bal.              41     0.99                                                                              20.12                                                                            18.16                                                                             5.15                                                                              4.13                                                                              1.04                                                                              2.05                                                                              -- -- -- --  --  --  0.198                                                                              bal.              42     0.96                                                                              20.13                                                                            18.14                                                                             5.14                                                                              4.12                                                                              1.05                                                                              2.03                                                                              -- -- -- --  --   0.0017                                                                            0.0019                                                                            bal.              43     0.97                                                                              20.16                                                                            18.13                                                                             5.16                                                                              4.15                                                                              1.04                                                                              2.02                                                                              0.73                                                                             -- -- --  --  --   0.0057                                                                            bal.              44     0.99                                                                              20.15                                                                            18.15                                                                             5.13                                                                              4.13                                                                              1.02                                                                              2.00                                                                              -- 0.78                                                                             -- --  --  0.074                                                                             --   bal.              45     0.97                                                                              20.16                                                                            18.14                                                                             5.16                                                                              4.14                                                                              1.04                                                                              2.01                                                                              0.57                                                                             -- -- --  --  0.050                                                                             0.047                                                                              bal.              46     1.05                                                                              15.22                                                                            10.03                                                                             5.20                                                                              5.01                                                                              0.72                                                                              0.23                                                                              -- -- 0.080                                                                            --  0.50                                                                              --  --   bal.              47     1.06                                                                              15.23                                                                            10.01                                                                             5.18                                                                              5.04                                                                              0.74                                                                              0.20                                                                              -- -- 0.069                                                                            --  --  --  0.042                                                                              bal.              48     1.02                                                                              15.20                                                                            10.02                                                                             5.13                                                                              5.02                                                                              0.70                                                                              0.24                                                                              -- -- -- --  1.00                                                                               0.0013                                                                           --   bal.              49     0.80                                                                              20.00                                                                            18.03                                                                             6.00                                                                              3.02                                                                              1.96                                                                              0.86                                                                              0.40                                                                             -- 0.006                                                                            0.52                                                                              --  --  --   bal.              50     0.81                                                                              20.02                                                                            18.06                                                                             6.04                                                                              3.04                                                                              1.95                                                                              0.85                                                                              0.17                                                                             -- 0.008                                                                            --  --  --  0.122                                                                              bal.              51     0.82                                                                              20.04                                                                            18.04                                                                             6.01                                                                              3.00                                                                              1.98                                                                              0.87                                                                              0.23                                                                             -- -- 1.03                                                                              --  0.007                                                                             --   bal.              52     0.83                                                                              20.05                                                                            18.05                                                                             6.03                                                                              3.02                                                                              1.97                                                                              0.86                                                                              -- 0.26                                                                             0.035                                                                            --  0.79                                                                              --  --   bal.              53     0.82                                                                              20.06                                                                            18.07                                                                             6.02                                                                              3.03                                                                              1.96                                                                              0.88                                                                              -- 0.19                                                                             0.007                                                                            --  --  0.125                                                                             --   bal.              54     0.84                                                                              20.07                                                                            18.02                                                                             6.01                                                                              3.05                                                                              1.90                                                                              0.86                                                                              -- 0.41                                                                             -- 0.59                                                                              --   0.0016                                                                            0.0015                                                                            bal.              55     0.80                                                                              20.03                                                                            18.04                                                                             6.03                                                                              3.02                                                                              1.91                                                                              0.85                                                                              -- -- 0.103                                                                            --  0.58                                                                              --   0.0013                                                                            bal.              56     0.83                                                                              20.01                                                                            18.05                                                                             6.04                                                                              3.01                                                                              1.95                                                                              0.84                                                                              0.30                                                                             -- 0.006                                                                            0.50                                                                              0.53                                                                              --   0.0017                                                                            bal.              57     0.80                                                                              20.01                                                                            18.07                                                                             6.02                                                                              3.05                                                                              1.97                                                                              0.86                                                                              -- 0.51                                                                             0.008                                                                            0.35                                                                              0.20                                                                              0.002                                                                             0.003                                                                              bal.              COMPARA-                                                                      TIVE                                                                          ALLOY                                                                         58      0.46*                                                                            20.13                                                                            26.95                                                                             4.95                                                                              5.05                                                                              1.55                                                                              0.13                                                                              -- -- -- --  --  --  --   bal.              59     2.23*                                                                             20.11                                                                            26.94                                                                             4.97                                                                              5.01                                                                              1.54                                                                              0.14                                                                              -- -- -- --  --  --  --   bal.              60     0.87                                                                              8.6*                                                                             18.04                                                                             5.96                                                                              4.59                                                                              1.58                                                                              0.05                                                                              -- -- -- --  --  --  --   bal.              61     0.86                                                                              30.5*                                                                            18.02                                                                             5.96                                                                              4.54                                                                              1.59                                                                              0.04                                                                              -- -- -- --  --  --  --   bal.              62     1.08                                                                              20.18                                                                            31.9*.sup.1                                                                       9.01                                                                              2.01                                                                              0.02                                                                              1.62                                                                              -- -- -- --  --  --  --   bal.              63     0.99                                                                              15.54                                                                            17.89                                                                             --* 8.70                                                                              0.61                                                                              0.63                                                                              -- -- -- --  --  --  --   bal.              64     0.96                                                                              15.56                                                                            17.90                                                                             10.91*                                                                            8.69                                                                              0.63                                                                              0.65                                                                              -- -- -- --  --  --  --   bal.              65     1.04                                                                              15.57                                                                            17.89                                                                             8.80                                                                              --* 0.64                                                                              0.68                                                                              -- -- -- --  --  --  --   bal.              66     1.02                                                                              15.56                                                                            17.87                                                                             1.53                                                                              10.81*                                                                            0.61                                                                              0.64                                                                              -- -- -- --  --  --  --   bal.              67     0.94                                                                              20.10                                                                            18.05                                                                             6.05                                                                              3.06                                                                              --* 3.59                                                                              -- -- -- --  --  --  --   bal.              68     0.90                                                                              20.06                                                                            18.04                                                                             6.02                                                                              3.04                                                                              4.63*                                                                             0.014                                                                             -- -- -- --  --  --  --   bal.              69     0.94                                                                              20.02                                                                            18.05                                                                             5.05                                                                              4.07                                                                              3.32                                                                              --* -- -- -- --  --  --  --   bal.              70     0.91                                                                              20.03                                                                            18.06                                                                             5.03                                                                              4.09                                                                               0.013                                                                            4.74*                                                                             -- -- -- --  --  --  --   bal.              prior art alloy                                                               71     1.32                                                                              25.89                                                                            bal.                                                                              --  0.50                                                                              --  --  1.59                                                                             2.00                                                                             -- --  --  --  V:                                                                                 11.04             72     1.28                                                                              33.92                                                                            17.89                                                                             3.06                                                                              2.98                                                                              --  --  -- -- -- --  --  --  Cu:                                                                                bal.              __________________________________________________________________________

                                      TABLE 2                                     __________________________________________________________________________            VICKERS HARDNESS                                                                            Charpy impact                                                                         Amount Number cycle                                     at room       strength                                                                              specific                                                                             till occurrence                                  temp.                                                                              900° C.                                                                    1000° C.                                                                    kg -m/cm.sup.2                                                                        wear × 10.sup.-7                                                               of crack                                 __________________________________________________________________________    ALLOY                                                                         OF THIS                                                                       INVENTION                                                                      1      316  153 143  1.87    1.95   >30                                       2      335  174 152  1.78    1.76   >30                                       3      382  254 189  1.18    1.06    30                                       4      329  152 140  2.33    1.61   >30                                       5      356  193 180  1.57    1.36    30                                       6      344  181 157  1.99    1.79   >30                                       7      321  150 138  2.70    2.00   >30                                       8      365  231 172  1.46    1.32   >30                                       9      382  252 203  1.37    1.00    27                                      10      364  231 172  1.90    1.37   >30                                      11      381  247 198  1.40    1.01    27                                      12      335  173 147  1.20    1.59   >30                                      13      384  259 196  1.17    0.99    24                                      14      338  176 151  1.29    1.50   >30                                      15      411  275 219  1.11    0.96    21                                      16      325  151 139  1.76    1.94   >30                                      17      348  169 151  1.78    1.81   >30                                      18      376  174 158  1.32    1.41    30                                      19      345  163 150  1.80    1.76   >30                                      20      342  161 147  1.92    1.61   >30                                      21      321  150 138  2.00    1.50   >30                                      22      379  251 170  1.47    1.14   >30                                      23      356  243 164  1.65    1.21   >30                                      24      323  155 139  2.24    1.72   >30                                      25      331  193 148  2.00    1.61   >30                                      26      353  231 173  1.90    1.42   >30                                      27      328  157 140  1.97    1.72   >30                                      28      337  196 154  1.90    1.63   >30                                      29      356  238 175  1.83    1.40   >30                                      30      352  226 170  1.64    1.18   >30                                      31      360  231 173  1.48    1.16   >30                                      32      361  232 175  1.44    1.10   >30                                      33      342  159 144  1.90    1.61   >30                                      34      344  161 147  1.86    1.59   >30                                      35      358  237 175  1.85    1.54   >30                                      36      350  224 149  1.84    1.28   >30                                      37      355  228 157  1.79    1.14    30                                      38      362  231 176  1.65    1.00    27                                      39      347  220 144  1.90    1.31   >30                                      40      352  223 155  1.81    1.19    30                                      41      358  226 172  1.70    1.07    27                                      42      351  224 151  1.76    1.24   >30                                      43      349  221 148  1.89    1.18   >30                                      44      347  220 147  1.90    1.21   >30                                      45      352  227 152  1.76    1.09   >30                                      46      358  250 158  1.59    1.00   >30                                      47      357  242 156  1.70    1.00   >30                                      48      365  253 162  1.61    0.93   >30                                      49      358  247 156  1.64    0.99   >30                                      50      369  252 176  1.81    0.92    30                                      51      359  248 158  1.62    0.94   >30                                      52      364  246 168  1.94    0.95   >30                                      53      376  258 179  1.75    0.91    30                                      54      350  221 154  1.81    1.22   >30                                      55      364  253 162  1.57    0.90    30                                      56      365  254 175  1.93    0.99   >30                                      57      366  256 183  1.90    0.97   >30                                      COMPARA-                                                                      TIVE ALLOY                                                                    58      293  134 119  0.96    3.62   >30                                      59      418  273 228  0.63    0.82    15                                      60      296  121  93  2.44    2.71   >30                                      61      362  198 188  0.62    1.43    15                                      62      294  133 110  2.83    2.84   >30                                      63      276  114  98  1.69    1.93   >30                                      64      410  265 223  0.39    0.87     6                                      65      279  115 103  1.64    1.88   >30                                      66      406  256 215  0.42    0.90     6                                      67      311  133 119  0.86    2.19   >30                                      68      432  293 238  0.52    0.80     6                                      69      310  126 109  1.00    2.45   >30                                      70      452  298 247  0.41    0.72     3                                      prior art alloy                                                               71      259   77  64  0.89    3.28    18                                      72      305  143 130  0.43    1.97     3                                      __________________________________________________________________________

EXAMPLE 2 C-Cr-Fe-W-Mo-Co-Ti-Al-Ni ALLOY The thermal and wear resistant,tough at elevated temperatures alloy in this invention are shown inEXAMPLE 2. The alloy is different from the content of the compositionthat the cobalt included one to 8% by weight in comparison with thealloy of EXAMPLE 1.

Alloys of Nos. 73 to 134 according to this invention, the comparativealloys of Nos. 135 to 148 and the prior art alloys of Nos. 149 to 150are shown in TABLE 3-1, TABLE 3-2, TABLE 3-3 and TABLE 3-4 respectively.Furthermore similar to EXAMPLE 1, the properties of these alloys areshown in TABLE 4-1, TABLE 4-2, TABLE 4-3, respectively. No. 80 alloy inTABLE 3-1 consists essentially of 0.99% by weight of carbon, 15.50%chromium, 17.86% of iron, 0.12% of tungsten, 8.73 of molybdenum, 4.02%of cobalt, 0.62% of titanium, 0.65% of aluminium and the balance nickel(% refers to percent by weight). No 80 alloy is shown 369 of Vickershardness at room temperature, 236 at 900° C., and 177 at 1000° C. inTABLE 4-1. No. 80 alloy also is shown 1.39 kg-m/cm² of Charpy impactstrength at room temperature, 1.29×10⁻⁷ of the amount of the specificwear, >30 of the number of the cycle till the occurrence of the crack.No. 80 alloy is improved in the hardness, the wear resistance atelevated temperatures due to include the content of cobalt in comparisonwith No. 6 of EXAMPLE 1.

In the comparison with comparative alloys (Nos. 135 to 148) and priorart alloys (Nos. 149 to 150), for example, No. 80 alloy of thisinvention is shown >30 of the number of the cycle till the occurrence ofthe crack, 177 of Vickers hardness at 1000° C., on other hand No. 149alloy of prior art showed 18 of the number of the cycle till theoccurrence of the crack, 64 of Vickers hardness at 1000° C.

The scope of the composition in this invention and its properties showedin TABLE 3-1, TABLE 3-2, TABLE 3-3, TABLE 3-4 and TABLE 4-1, TABLE 4-2,TABLE 4-3, respectively.

                                      TABLE 3                                     __________________________________________________________________________            COMPONENT OF COMPOSITION (% by weight)                                        C  Cr Fe W   Mo  Co Ti Al Si Mn  N   Nb Ta B   Zr   Ni                __________________________________________________________________________    ALLOY                                                                         OF THIS                                                                       INVENTION                                                                     73      0.57                                                                             20.13                                                                            26.98                                                                            4.91                                                                              5.08                                                                              5.00                                                                             1.53                                                                             0.11                                                                             -- --  --  -- -- --  --   bal.              74      1.19                                                                             20.14                                                                            26.96                                                                            4.93                                                                              5.05                                                                              5.03                                                                             1.55                                                                             0.13                                                                             -- --  --  -- -- --  --   bal.              75      1.96                                                                             20.11                                                                            26.95                                                                            4.95                                                                              5.02                                                                              5.04                                                                             1.54                                                                             0.10                                                                             -- --  --  -- -- --  --   bal.              76      0.84                                                                             10.2                                                                             18.00                                                                            5.95                                                                              4.59                                                                              2.10                                                                             1.59                                                                             0.06                                                                             -- --  --  -- -- --  --   bal.              77      0.85                                                                             27.5                                                                             18.06                                                                            5.94                                                                              4.56                                                                              2.09                                                                             1.56                                                                             0.02                                                                             -- --  --  -- -- --  --   bal.              78      1.06                                                                             20.19                                                                            1.1                                                                              8.95                                                                              2.03                                                                              5.00                                                                             0.05                                                                             1.62                                                                             -- --  --  -- -- --  --   bal.              79      1.08                                                                             20.24                                                                            29.7                                                                             8.99                                                                              2.06                                                                              5.04                                                                             0.02                                                                             1.59                                                                             -- --  --  -- -- --  --   bal.              80      0.99                                                                             15.50                                                                            17.86                                                                            0.12                                                                              8.73                                                                              4.02                                                                             0.62                                                                             0.65                                                                             -- --  --  -- -- --  --   bal.              81      0.98                                                                             15.53                                                                            17.88                                                                            9.89                                                                              2.13                                                                              4.04                                                                             0.61                                                                             0.63                                                                             -- --  --  -- -- --  --   bal.              82      1.04                                                                             15.56                                                                            17.89                                                                            8.79                                                                              0.11                                                                              4.06                                                                             0.67                                                                             0.66                                                                             -- --  --  -- -- --  --   bal.              83      1.01                                                                             15.58                                                                            17.91                                                                            1.58                                                                              9.92                                                                              4.01                                                                             0.65                                                                             0.64                                                                             -- --  --  -- -- --  --   bal.              84      1.33                                                                             25.95                                                                            18.01                                                                            5.20                                                                              5.00                                                                              1.1                                                                              0.60                                                                             0.67                                                                             -- --  --  -- -- --  --   bal.              85      1.32                                                                             25.96                                                                            18.00                                                                            5.19                                                                              5.03                                                                              7.9                                                                              0.62                                                                             0.64                                                                             -- --  --  -- -- --  --   bal.              86      0.90                                                                             20.10                                                                            18.01                                                                            6.04                                                                              3.02                                                                              1.55                                                                             0.012                                                                            3.54                                                                             -- --  --  -- -- --  --   bal.              87      0.91                                                                             20.09                                                                            18.04                                                                            6.06                                                                              3.05                                                                              1.52                                                                             4.48                                                                             0.013                                                                            -- --  --  -- -- --  --   bal.              88      0.92                                                                             20.02                                                                            18.01                                                                            5.01                                                                              4.09                                                                              2.08                                                                             3.27                                                                             0.012                                                                            -- --  --  -- -- --  --   bal.              89      0.91                                                                             20.04                                                                            18.05                                                                            5.06                                                                              4.07                                                                              2.10                                                                             0.015                                                                            4.46                                                                             -- --  --  -- -- --  --   bal.              90      1.00                                                                             15.19                                                                            18.00                                                                            5.18                                                                              3.09                                                                              3.00                                                                             1.37                                                                             0.11                                                                             0.011                                                                            --  --  -- -- --  --   bal.              91      0.98                                                                             15.17                                                                            18.04                                                                            5.20                                                                              3.06                                                                              3.01                                                                             1.39                                                                             0.10                                                                             1.46                                                                             --  --  -- -- --  --   bal.              92      0.99                                                                             15.19                                                                            18.02                                                                            5.19                                                                              3.04                                                                              3.00                                                                             1.37                                                                             0.11                                                                             2.93                                                                             --  --  -- -- --  --   bal.              93      0.99                                                                             25.00                                                                            7.89                                                                             6.72                                                                              3.20                                                                              4.60                                                                             0.11                                                                             1.04                                                                             -- 0.0053                                                                            --  -- -- --  --   bal.              94      0.97                                                                             25.06                                                                            7.86                                                                             6.78                                                                              3.21                                                                              4.61                                                                             0.13                                                                             1.05                                                                             -- 1.46                                                                              --  -- -- --  --   bal.              95      0.99                                                                             25.03                                                                            7.88                                                                             6.79                                                                              3.19                                                                              4.59                                                                             0.14                                                                             1.07                                                                             -- 2.98                                                                              --  -- -- --  --   bal.              96      1.22                                                                             15.05                                                                            10.03                                                                            5.06                                                                              4.99                                                                              2.05                                                                             0.60                                                                             0.12                                                                             -- --   0.0051                                                                           -- -- --  --   bal.              97      1.18                                                                             15.08                                                                            10.06                                                                            5.04                                                                              4.97                                                                              2.03                                                                             0.61                                                                             0.14                                                                             -- --  0.098                                                                             -- -- --  --   bal.              98      1.21                                                                             15.07                                                                            10.04                                                                            5.03                                                                              4.98                                                                              2.06                                                                             0.60                                                                             0.11                                                                             -- --  0.198                                                                             -- -- --  --   bal.              99      1.23                                                                             15.05                                                                            10.02                                                                            5.01                                                                              5.00                                                                              2.04                                                                             0.61                                                                             0.13                                                                             0.83                                                                             --  0.089                                                                             -- -- --  --   bal.              100     1.22                                                                             15.06                                                                            10.03                                                                            5.04                                                                              4.99                                                                              2.02                                                                             0.64                                                                             0.12                                                                             -- 0.76                                                                              0.058                                                                             -- -- --  --   bal.              101     0.98                                                                             20.04                                                                            18.05                                                                            6.01                                                                              3.01                                                                              2.50                                                                             2.05                                                                             0.99                                                                             -- --  --  0.011                                                                            -- --  --   bal.              102     0.97                                                                             20.03                                                                            18.04                                                                            6.05                                                                              3.00                                                                              2.47                                                                             2.06                                                                             0.96                                                                             -- --  --  0.96                                                                             -- --  --   bal.              103     0.95                                                                             20.01                                                                            18.02                                                                            6.04                                                                              3.02                                                                              2.49                                                                             2.03                                                                             0.98                                                                             -- --  --  1.48                                                                             -- --  --   bal.              104     0.98                                                                             20.04                                                                            18.03                                                                            6.08                                                                              3.06                                                                              2.57                                                                             1.99                                                                             0.99                                                                             -- --  --  -- 0.013                                                                            --  --   bal.              105     0.99                                                                             20.01                                                                            18.04                                                                            6.05                                                                              3.07                                                                              2.55                                                                             2.01                                                                             1.00                                                                             -- --  --  -- 1.04                                                                             --  --   bal.              106     0.97                                                                             20.05                                                                            18.06                                                                            6.04                                                                              3.03                                                                              2.58                                                                             2.00                                                                             0.98                                                                             -- --  --  -- 1.47                                                                             --  --   bal.              107     0.96                                                                             20.09                                                                            18.04                                                                            6.07                                                                              3.02                                                                              2.56                                                                             2.01                                                                             0.96                                                                             -- --  --  0.42                                                                             0.40                                                                             --  --   bal.              108     0.95                                                                             20.10                                                                            18.05                                                                            6.06                                                                              3.01                                                                              2.52                                                                             2.03                                                                             0.92                                                                             0.50                                                                             --  --  0.98                                                                             -- --  --   bal.              109     0.97                                                                             20.08                                                                            18.07                                                                            6.04                                                                              3.04                                                                              2.53                                                                             2.02                                                                             0.94                                                                             0.52                                                                             --  --  -- 0.96                                                                             --  --   bal.              110     0.98                                                                             20.10                                                                            18.05                                                                            6.03                                                                              3.06                                                                              2.55                                                                             2.00                                                                             0.96                                                                             -- 0.87                                                                              --  0.05                                                                             -- --  --   bal.              111     0.99                                                                             20.09                                                                            18.07                                                                            6.05                                                                              3.04                                                                              2.54                                                                             2.03                                                                             0.98                                                                             -- 0.89                                                                              --  -- 0.06                                                                             --  --   bal.              112     0.97                                                                             20.11                                                                            18.09                                                                            6.07                                                                              3.03                                                                              2.52                                                                             2.01                                                                             0.97                                                                             0.65                                                                             --  --  0.34                                                                             0.36                                                                             --  --   bal.              113     0.99                                                                             20.09                                                                            18.06                                                                            5.03                                                                              4.07                                                                              2.04                                                                             0.93                                                                             1.98                                                                             -- --  --  -- --  0.0011                                                                           --   bal.              114     0.97                                                                             20.07                                                                            18.08                                                                            5.06                                                                              4.06                                                                              2.05                                                                             0.92                                                                             1.96                                                                             -- --  --  -- -- 0.099                                                                             --   bal.              115     0.95                                                                             20.04                                                                            18.09                                                                            5.04                                                                              4.10                                                                              2.03                                                                             0.92                                                                             1.97                                                                             -- --  --  -- -- 0.197                                                                             --   bal.              116     0.97                                                                             20.11                                                                            18.15                                                                            5.13                                                                              4.14                                                                              2.07                                                                             1.07                                                                             2.04                                                                             -- --  --  -- -- --   0.0012                                                                            bal.              117     0.98                                                                             20.13                                                                            18.14                                                                            5.15                                                                              4.10                                                                              2.06                                                                             1.08                                                                             2.01                                                                             -- --  --  -- -- --  0.104                                                                              bal.              118     0.96                                                                             20.11                                                                            18.16                                                                            5.12                                                                              4.11                                                                              2.04                                                                             1.06                                                                             2.03                                                                             -- --  --  -- -- --  0.199                                                                              bal.              119     0.97                                                                             20.12                                                                            18.15                                                                            5.12                                                                              4.10                                                                              2.03                                                                             1.07                                                                             2.00                                                                             -- --  --  -- --  0.0016                                                                            0.0018                                                                            bal.              120     0.99                                                                             20.14                                                                            18.16                                                                            5.14                                                                              4.12                                                                              2.05                                                                             1.08                                                                             2.01                                                                             0.70                                                                             --  --  -- -- --   0.0052                                                                            bal.              121     0.98                                                                             20.15                                                                            18.13                                                                            5.15                                                                              4.11                                                                              2.03                                                                             1.03                                                                             2.00                                                                             -- 0.77                                                                              --  -- -- 0.076                                                                             --   bal.              122     0.97                                                                             20.14                                                                            18.17                                                                            5.13                                                                              4.14                                                                              2.04                                                                             1.05                                                                             2.03                                                                             0.59                                                                             --  --  -- -- 0.054                                                                             0.049                                                                              bal.              123     1.06                                                                             15.21                                                                            10.04                                                                            5.19                                                                              5.00                                                                              2.02                                                                             0.70                                                                             0.24                                                                             -- --  0.083                                                                             0.51                                                                             -- --  --   bal.              124     1.07                                                                             15.20                                                                            10.03                                                                            5.17                                                                              5.01                                                                              2.03                                                                             0.73                                                                             0.21                                                                             -- --  0.071                                                                             -- -- --  0.046                                                                              bal.              125     1.03                                                                             15.22                                                                            10.06                                                                            5.11                                                                              5.04                                                                              2.01                                                                             0.74                                                                             0.22                                                                             -- --  --  1.01                                                                             -- --   0.0012                                                                            bal.              126     0.81                                                                             20.03                                                                            18.00                                                                            6.03                                                                              3.01                                                                              2.50                                                                             1.98                                                                             0.87                                                                             0.41                                                                             --  0.007                                                                             -- 0.53                                                                             --  --   bal.              127     0.82                                                                             20.01                                                                            18.07                                                                            6.02                                                                              3.00                                                                              2.49                                                                             1.96                                                                             0.85                                                                             0.24                                                                             --  0.013                                                                             -- -- 0.003                                                                             --   bal.              128     0.84                                                                             20.04                                                                            18.06                                                                            6.04                                                                              3.03                                                                              2.48                                                                             1.97                                                                             0.86                                                                             0.15                                                                             --  --  -- 0.07                                                                             --  0.124                                                                              bal.              129     0.81                                                                             20.02                                                                            18.08                                                                            6.05                                                                              3.04                                                                              2.50                                                                             1.96                                                                             0.87                                                                             -- 0.23                                                                              0.033                                                                             0.78                                                                             -- --  --   bal.              130     0.83                                                                             20.03                                                                            18.07                                                                            6.02                                                                              3.02                                                                              2.50                                                                             1.98                                                                             0.88                                                                             -- 0.20                                                                              0.006                                                                             -- -- 0.126                                                                             --   bal.              131     0.80                                                                             20.05                                                                            18.06                                                                            6.04                                                                              3.01                                                                              2.49                                                                             1.99                                                                             0.86                                                                             -- 0.59                                                                              --  -- 0.87                                                                             --  0.007                                                                              bal.              132     0.82                                                                             20.02                                                                            18.05                                                                            6.05                                                                              3.03                                                                              2.51                                                                             1.95                                                                             0.85                                                                             -- --  0.007                                                                             -- 0.30                                                                             0.005                                                                             0.003                                                                              bal.              133     0.82                                                                             20.05                                                                            18.00                                                                            6.07                                                                              3.09                                                                              2.51                                                                             1.99                                                                             0.89                                                                             0.51                                                                             --  0.056                                                                             -- 0.62                                                                             --  0.005                                                                              bal.              134     0.83                                                                             20.03                                                                            18.03                                                                            6.09                                                                              3.08                                                                              2.50                                                                             2.01                                                                             0.87                                                                             -- 0.53                                                                              0.009                                                                             0.32                                                                             0.21                                                                             0.003                                                                             0.002                                                                              bal.              135     0.50*                                                                            20.12                                                                            26.97                                                                            4.90                                                                              5.09                                                                              5.01                                                                             1.54                                                                             0.12                                                                             -- --  --  -- -- --  --   bal.              136     2.13*                                                                            20.15                                                                            26.98                                                                            4.95                                                                              5.03                                                                              5.00                                                                             1.56                                                                             0.15                                                                             -- --  --  -- -- --  --   bal.              137     0.86                                                                              8.9*                                                                            18.02                                                                            5.96                                                                              4.57                                                                              2.10                                                                             1.55                                                                             0.07                                                                             -- --  --  -- -- --  --   bal.              138     0.84                                                                             31.3*                                                                            18.05                                                                            5.95                                                                              4.53                                                                              2.07                                                                             1.57                                                                             0.03                                                                             -- --  --  -- -- --  --   bal.              139     1.06                                                                             20.20                                                                            31.1*                                                                            9.03                                                                              2.02                                                                              5.05                                                                             0.01                                                                             1.61                                                                             -- --  --  -- -- --  --   bal.              140     1.00                                                                             15.51                                                                            17.88                                                                             --*                                                                              8.75                                                                              4.01                                                                             0.65                                                                             0.64                                                                             -- --  --  -- -- --  --   bal.              141     0.98                                                                             15.53                                                                            17.89                                                                            11.03*                                                                            8.73                                                                              4.03                                                                             0.64                                                                             0.62                                                                             -- --  --  -- -- --  --   bal.              142     1.03                                                                             15.58                                                                            17.87                                                                            8.80                                                                               --*                                                                              4.07                                                                             0.65                                                                             0.67                                                                             -- --  --  -- -- --  --   bal.              143     1.02                                                                             15.57                                                                            17.89                                                                            1.54                                                                              10.89*                                                                            4.03                                                                             0.62                                                                             0.65                                                                             -- --  --  -- -- --  --   bal.              144     1.34                                                                             25.90                                                                            18.04                                                                            5.21                                                                              5.02                                                                               --*                                                                             0.63                                                                             0.68                                                                             -- --  --  -- -- --  --   bal.              145     0.92                                                                             20.13                                                                            18.06                                                                            6.07                                                                              3.05                                                                              1.59                                                                             --*                                                                              3.57                                                                             -- --  --  -- -- --  --   bal.              146     0.89                                                                             20.07                                                                            18.03                                                                            6.06                                                                              3.06                                                                              1.54                                                                             4.71*                                                                            0.015                                                                            -- --  --  -- -- --  --   bal.              147     0.94                                                                             20.05                                                                            18.04                                                                            5.04                                                                              4.08                                                                              2.10                                                                             3.29                                                                             --*                                                                              -- --  --  -- -- --  --   bal.              148     0.93                                                                             20.02                                                                            18.03                                                                            5.06                                                                              4.07                                                                              2.12                                                                             0.014                                                                            4.69*                                                                            -- --  --  -- -- --  --   bal.              prior art alloy                                                               149     1.32                                                                             25.89                                                                            bal.                                                                             --  0.50                                                                              -- -- -- 1.59                                                                             2.00                                                                              --  -- -- --   V:                                                                                11.04             150     1.28                                                                             33.92                                                                            17.89                                                                            3.06                                                                              2.98                                                                              -- -- -- 0.83                                                                             0.76                                                                              --  -- -- --  Cu:                                                                                bal.              __________________________________________________________________________

                                      TABLE 4                                     __________________________________________________________________________            VICKERS HARDNESS                                                                            Charpy impact                                                                         Amount Number cycle                                     at room       strength                                                                              specific                                                                             till occurrence                                  temp.                                                                              900° C.                                                                    1000° C.                                                                    kg -m/cm.sup.2                                                                        wear × 10.sup.-7                                                               of crack                                 __________________________________________________________________________    ALLOY                                                                         OF THIS                                                                       INVENTION                                                                     73      319  161 150  1.82    1.89   >30                                      74      340  182 157  1.75    1.73   >30                                      75      391  258 192  1.05    0.98    30                                      76      331  157 143  2.21    1.59   >30                                      77      360  198 185  1.53    1.26    30                                      78      349  186 162  1.91    1.77   >30                                      79      326  152 141  2.64    1.98   >30                                      80      369  236 177  1.39    1.29   >30                                      81      387  257 208  1.30    0.93    27                                      82      368  235 176  1.89    1.32   >30                                      83      386  252 203  1.31    0.96    27                                      84      331  168 145  1.99    1.92   >30                                      85      350  189 178  2.14    1.42   >30                                      86      340  178 151  1.16    1.53   >30                                      87      389  264 201  1.09    0.96    24                                      88      343  180 155  1.20    1.43   >30                                      89      416  279 223  1.03    0.92    21                                      90      329  156 141  1.74    1.92   >30                                      91      351  172 155  1.71    1.78   >30                                      92      379  178 163  1.22    1.37    30                                      93      349  169 155  1.77    1.74   >30                                      94      347  166 151  1.86    1.52   >30                                      95      326  155 142  1.92    1.47   >30                                      96      353  221 155  1.59    1.28   >30                                      97      385  254 173  1.46    1.12    30                                      98      435  293 266  1.08    0.91    21                                      99      384  256 175  1.41    1.03   >30                                      100     360  248 170  1.55    1.10   >30                                      101     328  159 143  2.17    1.68   >30                                      102     336  198 152  2.06    1.59   >30                                      103     358  236 178  1.92    1.34   >30                                      104     331  162 145  2.01    1.67   >30                                      105     342  201 157  1.98    1.54   >30                                      106     360  242 179  1.90    1.31   >30                                      107     359  230 175  1.50    1.09   >30                                      108     363  234 178  1.43    1.06   >30                                      109     364  236 179  1.41    1.05   >30                                      110     345  163 149  1.87    1.54   >30                                      111     346  165 150  1.85    1.53   >30                                      112     362  241 181  1.85    1.44   >30                                      113     354  228 153  1.82    1.17   >30                                      114     359  231 162  1.76    1.03    30                                      115     365  236 180  1.63    0.98    27                                      116     352  225 151  1.84    1.20   >30                                      117     357  228 160  1.82    1.13    30                                      118     362  233 178  1.76    1.04    27                                      119     355  228 155  1.74    1.16   >30                                      120     353  226 153  1.82    1.12   >30                                      121     352  225 152  1.84    1.14   >30                                      122     357  230 157  1.72    1.06   >30                                      123     363  254 162  1.53    0.98   >30                                      124     361  247 160  1.61    0.99   >30                                      125     371  258 166  1.54    0.87   >30                                      126     362  251 160  1.55    0.96   >30                                      127     365  253 164  1.57    0.94   >30                                      128     374  257 180  1.80    0.90    30                                      129     370  251 173  1.90    0.93   >30                                      130     380  263 184  1.72    0.87    30                                      131     368  249 171  1.93    0.95   >30                                      132     371  253 174  1.91    0.90   >30                                      133     373  256 190  1.76    0.96   >30                                      134     370  252 187  1.89    0.94   >30                                      COMPARA-                                                                      TIVE ALLOY                                                                    135     300  137 125  0.93    3.51    30                                      136     423  279 233  0.53    0.70    12                                      137     300  126  98  2.30    2.57   >30                                      138     370  210 192  0.57    1.34    15                                      139     303  132 115  2.67    2.68   >30                                      140     281  122 107  1.61    1.72   >30                                      141     418  275 230  0.32    1.90     6                                      142     286  135 111  1.50    1.59   >30                                      143     415  270 227  0.34    0.82     6                                      144     308  134 120  2.20    2.14   >30                                      145     323  135 122  0.85    2.10   >30                                      146     438  304 246  0.48    0.70     6                                      147     314  134 114  0.97    2.02   >30                                      148     456  309 250  0.36    0.57     3                                      prior art alloy                                                               149     259   77  64  0.89    3.28    18                                      150     305  143 130  0.43    1.97     3                                      __________________________________________________________________________

EXAMPLE 3 C-Si-Mn-Cr-Fe-W-Mo-Ti-Al-Ni ALLOY The alloys shown in EXAMPLE3 are different from the content of the composition that the alloyinclude silicon and manganese in comparison with the alloy of EXAMPLE 1.

In EXAMPLE 4, the alloys according to this invention (Nos. 153 to 180),the comparative alloys (Nos. 181 to 197) and the prior art alloys (Nos.151 to 152) are shown in TABLE 5-1, TABLE 5-2, TABLE 5-3 similar toEXAMPLE 1.

No. 157 of TABLE 5-1 consists essentially of 0.97% by weight of carbon,1.63% of silicon, 0.67% of manganese, 15.10% of chromium, 17.98% ofiron, 5.19% of tungsten, 3.04% of molybdenum, 1.21% of titanium, 0.15%of aluminium and the balance nickel (% refers to percent by weight).

Furthermore, the alloy of Nos. 176 to 190 include optionally at leastone selected from the group consisting of 0.005 to 0.2% of nitrogen,0.01 to 1.5% of niobium and tantalum, 0.001 to 0.2% of boron andzirconium.

The properties of Nos. 151 to 207 alloys are shown in TABLE 6-1, TABLE6-2 similar to EXAMPLE 1. For example, No. 157 alloy is shown 349 ofVickers hardness at room temperature, 169 at 900° C., 154 at 1000° C.and 1.74 kg-m/cm² of Charpy impact strength at room temperature,1.80×10⁻⁷ of the amount of the specific wear and >30 of the number ofthe cycle till the occurrence of the crack. Alloys of EXAMPLE 3 areshown the component of the composition and its properties in TABLE 5-1,TABLE 5-2, TABLE 5-3 and TABLE 6-1, TABLE 6-2, respectively.

                                      TABLE 5                                     __________________________________________________________________________    COMPONENT OF COMPOSITION (% by weight)                                        C        Si Mn Cr  Fe  W   Mo  Ti Al N   Nb Ta B   Zr Cu V  Ni                __________________________________________________________________________     Prior art                                                                    alloy                                                                         151  1.32                                                                              1.59                                                                             2.00                                                                             25.89                                                                             bal.                                                                              --  0.50                                                                              -- -- --  -- -- --  -- -- 0.18                                                                             11.04             152  1.28                                                                              0.83                                                                             0.76                                                                             33.92                                                                             17.89                                                                             3.06                                                                              2.98                                                                              -- -- --  -- -- --  -- 4.98                                                                             -- bal.              ALLOY                                                                         OF THIS                                                                       INVEN-                                                                        TION                                                                          153  0.57                                                                              0.81                                                                             0.68                                                                             20.16                                                                             26.98                                                                             4.90                                                                              5.04                                                                              1.52                                                                             0.06                                                                             --  -- -- --  -- -- -- bal.              154  1.24                                                                              0.83                                                                             0.69                                                                             20.22                                                                             27.14                                                                             5.03                                                                              5.08                                                                              1.50                                                                             0.08                                                                             --  -- -- --  -- -- -- bal.              155  1.98                                                                              0.80                                                                             0.71                                                                             20.23                                                                             27.09                                                                             4.99                                                                              5.06                                                                              1.48                                                                             0.06                                                                             --  -- -- --  -- -- -- bal.              156  0.98                                                                              0.12                                                                             0.70                                                                             15.09                                                                             18.04                                                                             5.18                                                                              3.01                                                                              1.20                                                                             0.13                                                                             --  -- -- --  -- -- -- bal.              157  0.97                                                                              1.63                                                                             0.67                                                                             15.10                                                                             17.98                                                                             5.19                                                                              3.04                                                                              1.21                                                                             0.15                                                                             --  -- -- --  -- -- -- bal.              158  0.94                                                                              2.95                                                                             0.69                                                                             15.12                                                                             18.07                                                                             5.15                                                                              3.06                                                                              1.20                                                                             0.11                                                                             --  -- -- --  -- -- -- bal.              159  0.99                                                                              0.67                                                                             0.10                                                                             25.04                                                                              7.87                                                                             6.78                                                                              3.20                                                                              0.11                                                                             1.03                                                                             --  -- -- --  -- -- -- bal.              160  0.97                                                                              0.68                                                                             1.59                                                                             24.99                                                                              7.90                                                                             6.80                                                                              3.21                                                                              0.13                                                                             1.05                                                                             --  -- -- --  -- -- -- bal.              161  0.98                                                                              0.69                                                                             2.99                                                                             25.06                                                                              7.99                                                                             6.79                                                                              3.20                                                                              0.11                                                                             1.03                                                                             --  -- -- --  -- -- -- bal.              162  0.84                                                                              0.70                                                                             0.72                                                                             10.52                                                                             18.06                                                                             5.88                                                                              4.63                                                                              1.58                                                                             0.06                                                                             --  -- -- --  -- -- -- bal.              163  0.86                                                                              0.72                                                                             0.69                                                                             27.79                                                                             17.93                                                                             5.92                                                                              4.60                                                                              1.59                                                                             0.02                                                                             --  -- -- --  -- -- -- bal.              164  1.01                                                                              0.69                                                                             0.80                                                                             20.18                                                                              3.12                                                                             8.96                                                                              2.04                                                                              0.02                                                                             1.48                                                                             --  -- -- --  -- -- -- bal.              165  1.00                                                                              0.70                                                                             0.83                                                                             20.20                                                                             29.59                                                                             8.98                                                                              2.03                                                                              0.05                                                                             1.50                                                                             --  -- -- --  -- -- -- bal.              166  0.97                                                                              0.66                                                                             0.79                                                                             15.42                                                                             17.98                                                                             0.53                                                                              8.68                                                                              0.50                                                                             0.53                                                                             --  -- -- --  -- -- -- bal.              167  0.99                                                                              0.70                                                                             0.80                                                                             15.51                                                                             17.68                                                                             9.91                                                                              2.14                                                                              0.53                                                                             0.50                                                                             --  -- -- --  -- -- -- bal.              168  1.00                                                                              0.62                                                                             0.79                                                                             15.48                                                                             17.92                                                                             8.70                                                                              0.52                                                                              0.50                                                                             0.54                                                                             --  -- -- --  -- -- -- bal.              169  1.03                                                                              0.60                                                                             0.80                                                                             15.53                                                                             17.94                                                                             2.02                                                                              9.91                                                                              0.49                                                                             0.51                                                                             --  -- -- --  -- -- -- bal.              170  0.91                                                                              0.68                                                                             0.79                                                                             20.04                                                                             18.00                                                                             6.04                                                                              3.11                                                                              0.013                                                                            2.50                                                                             --  -- -- --  -- -- -- bal.              171  0.88                                                                              0.69                                                                             0.77                                                                             20.06                                                                             18.10                                                                             6.10                                                                              3.20                                                                              1.73                                                                             1.03                                                                             --  -- -- --  -- -- -- bal.              172  0.89                                                                              0.66                                                                             0.79                                                                             20.03                                                                             18.08                                                                             6.04                                                                              3.09                                                                              3.47                                                                             0.07                                                                             --  -- -- --  -- -- -- bal.              173  0.91                                                                              0.70                                                                             0.80                                                                             19.97                                                                             18.07                                                                             5.06                                                                              4.01                                                                              3.06                                                                             0.011                                                                            --  -- -- --  -- -- -- bal.              174  0.90                                                                              0.71                                                                             0.81                                                                             20.02                                                                             18.10                                                                             5.10                                                                              4.06                                                                              0.96                                                                             1.69                                                                             --  -- -- --  -- -- -- bal.              175  0.89                                                                              0.69                                                                             0.80                                                                             19.97                                                                             18.06                                                                             5.13                                                                              4.09                                                                              0.05                                                                             3.49                                                                             --  -- -- --  -- -- -- bal.              176  1.16                                                                              0.70                                                                             0.78                                                                             15.07                                                                             10.11                                                                             5.07                                                                              4.98                                                                              0.57                                                                             0.07                                                                             0.0056                                                                            -- -- --  -- -- -- bal.              177  1.18                                                                              0.70                                                                             0.80                                                                             15.00                                                                             10.01                                                                             5.00                                                                              4.99                                                                              0.60                                                                             0.11                                                                             0.103                                                                             -- -- --  -- -- -- bal.              178  1.20                                                                              0.72                                                                             0.83                                                                             15.07                                                                             10.07                                                                             5.01                                                                              4.96                                                                              0.58                                                                             0.12                                                                             0.192                                                                             -- -- --  -- -- -- bal.              179  0.92                                                                              0.71                                                                             0.80                                                                             20.00                                                                             18.02                                                                             6.08                                                                              3.02                                                                              2.03                                                                             0.98                                                                             --  0.012                                                                            -- --  -- -- -- bal.              180  0.94                                                                              0.70                                                                             0.78                                                                             20.11                                                                             18.08                                                                             6.09                                                                              3.10                                                                              1.98                                                                             0.99                                                                             --  -- 1.428                                                                            --  -- -- -- bal.              181  0.90                                                                              0.70                                                                             0.80                                                                             20.07                                                                             18.01                                                                             6.03                                                                              3.06                                                                              1.96                                                                             0.93                                                                             --  0.321                                                                            0.330                                                                            --  -- -- -- bal.              182  0.97                                                                              0.69                                                                             0.78                                                                             19.99                                                                             18.08                                                                             5.09                                                                              4.10                                                                              0.93                                                                             1.97                                                                             --  -- -- 0.0012                                                                            -- -- -- bal.              183  0.98                                                                              0.67                                                                             0.79                                                                             20.13                                                                             18.10                                                                             5.10                                                                              4.13                                                                              1.08                                                                             2.03                                                                             --  -- -- --  0.195                                                                            -- -- bal.              184  0.97                                                                              0.70                                                                             0.81                                                                             20.18                                                                             18.09                                                                             5.08                                                                              4.11                                                                              1.03                                                                             2.01                                                                             --  -- -- 0.052                                                                             0.051                                                                            -- -- bal.              185  1.07                                                                              0.68                                                                             0.78                                                                             15.12                                                                              9.98                                                                             5.16                                                                              5.00                                                                              0.63                                                                             0.20                                                                             0.091                                                                             0.763                                                                            -- --  -- -- -- bal.              186  1.06                                                                              0.71                                                                             0.81                                                                             15.14                                                                             10.03                                                                             5.23                                                                              4.98                                                                              0.59                                                                             0.17                                                                             0.064                                                                             -- 0.631                                                                            --  -- -- -- bal.              187  1.08                                                                              0.69                                                                             0.80                                                                             15.20                                                                             10.08                                                                             5.26                                                                              4.99                                                                              0.61                                                                             0.19                                                                             0.080                                                                             -- -- 0.089                                                                             -- -- -- bal.              188  1.04                                                                              0.70                                                                             0.79                                                                             15.13                                                                             10.06                                                                             5.18                                                                              5.00                                                                              0.57                                                                             0.16                                                                             0.073                                                                             -- -- --  0.065                                                                            -- -- bal.              189  0.92                                                                              0.69                                                                             0.78                                                                             20.02                                                                             18.10                                                                             6.00                                                                              3.12                                                                              1.97                                                                             0.93                                                                             --  0.465                                                                            0.321                                                                            --  0.033                                                                            -- -- bal.              190  0.91                                                                              0.60                                                                             0.73                                                                             20.08                                                                             18.02                                                                             6.04                                                                              3.09                                                                              2.00                                                                             0.92                                                                             0.070                                                                             0.412                                                                            0.396                                                                            0.061                                                                             0.031                                                                            -- -- bal.              COM-                                                                          PAR-                                                                          ATIVE                                                                         ALLOY                                                                         191  0.50*                                                                             0.82                                                                             0.70                                                                             20.09                                                                             26.96                                                                             4.92                                                                              4.98                                                                              1.49                                                                             0.08                                                                             --  -- -- --  -- -- -- bal.              192  2.14*                                                                             0.85                                                                             0.69                                                                             20.10                                                                             27.00                                                                             4.98                                                                              4.99                                                                              1.51                                                                             0.06                                                                             --  -- -- --  -- -- -- bal.              193  1.01                                                                              --*                                                                              0.68                                                                             15.11                                                                             18.02                                                                             5.21                                                                              3.04                                                                              1.21                                                                             0.11                                                                             --  -- -- --  -- -- -- bal.              194  1.04                                                                              3.24*                                                                            0.71                                                                             15.22                                                                             18.01                                                                             5.18                                                                              3.07                                                                              1.22                                                                             0.10                                                                             --  -- -- --  -- -- -- bal.              195  1.00                                                                              0.68                                                                             --*                                                                              25.00                                                                              8.01                                                                             6.81                                                                              3.18                                                                              0.11                                                                             1.02                                                                             --  -- -- --  -- -- -- bal.              196  0.98                                                                              0.70                                                                             3.16*                                                                            25.04                                                                              7.99                                                                             6.80                                                                              3.19                                                                              0.14                                                                             1.00                                                                             --  -- -- --  -- -- -- bal.              197  0.85                                                                              0.72                                                                             0.70                                                                              9.01*                                                                            18.02                                                                             5.90                                                                              4.64                                                                              1.59                                                                             0.05                                                                             --  -- -- --  -- -- -- bal.              198  0.89                                                                              0.69                                                                             0.72                                                                             30.01*                                                                            18.01                                                                             5.92                                                                              4.66                                                                              1.60                                                                             0.08                                                                             --  -- -- --  -- -- -- bal.              199  1.04                                                                              0.70                                                                             0.80                                                                             20.16                                                                              32.03*                                                                           9.01                                                                              2.00                                                                              0.07                                                                             1.50                                                                             --  -- -- --  -- -- -- bal.              200  0.99                                                                              0.71                                                                             0.79                                                                             15.51                                                                             18.01                                                                             --* 9.03                                                                              0.52                                                                             0.51                                                                             --  -- -- --  -- -- -- bal.              201  1.00                                                                              0.68                                                                             0.80                                                                             15.50                                                                             17.70                                                                              11.03*                                                                           8.97                                                                              0.54                                                                             0.50                                                                             --  -- -- --  -- -- -- bal.              202  1.02                                                                              0.59                                                                             0.81                                                                             15.49                                                                             18.00                                                                             8.84                                                                              --* 0.51                                                                             0.54                                                                             --  -- -- --  -- -- -- bal.              203  1.00                                                                              0.69                                                                             0.79                                                                             15.52                                                                             17.99                                                                             2.01                                                                              10.85                                                                             0.49                                                                             0.50                                                                             --  -- -- --  -- -- -- bal.              204  0.91                                                                              0.68                                                                             0.80                                                                             20.08                                                                             18.00                                                                             6.07                                                                              3.17                                                                              --*                                                                              2.51                                                                             --  -- -- --  -- -- -- zbal.             205  0.92                                                                              0.71                                                                             0.79                                                                             20.02                                                                             18.05                                                                             6.08                                                                              3.11                                                                              3.59*                                                                            0.06                                                                             --  -- -- --  -- -- -- bal.              206  0.90                                                                              0.66                                                                             0.81                                                                             20.01                                                                             18.05                                                                             5.09                                                                              4.07                                                                              3.01                                                                             --*                                                                              --  -- -- --  -- -- -- bal.              207  0.93                                                                              0.70                                                                             0.78                                                                             20.03                                                                             18.09                                                                             5.12                                                                              4.05                                                                              0.06                                                                             3.61*                                                                            --  -- -- --  -- -- -- bal.              __________________________________________________________________________

                                      TABLE 6                                     __________________________________________________________________________            VICKERS HARDNESS                                                                            Charpy impact                                                                         Amount Number cycle                                     at room       strength                                                                              specific                                                                             till occurrence                                  temp.                                                                              900° C.                                                                    1000° C.                                                                    kg -m/cm.sup.2                                                                        wear × 10.sup.-7                                                               of crack                                 __________________________________________________________________________    prior art alloy                                                               151     259   77  64  0.89    3.28    18                                      152     305  143 130  0.43    1.97     3                                      ALLOY                                                                         OF THIS                                                                       INVENTION                                                                     153     319  158 147  1.84    1.92   >30                                      154     340  179 159  1.77    1.76   >30                                      155     387  259 193  1.11    1.02    30                                      156     328  154 150  1.76    1.95   >30                                      157     349  169 154  1.74    1.80   >30                                      158     376  172 160  1.24    1.48    30                                      159     347  166 152  1.78    1.79   >30                                      160     345  163 148  1.87    1.60   >30                                      161     326  154 141  1.96    1.47   >30                                      162     330  157 143  2.16    1.58   >30                                      163     359  193 182  1.53    1.26    30                                      164     347  181 161  1.86    1.78   >30                                      165     322  150 139  2.69    1.96   >30                                      166     370  231 174  1.33    1.30   >30                                      167     389  252 207  1.24    0.94    27                                      168     367  230 172  1.31    1.30   >30                                      169     384  249 199  1.30    0.98    27                                      170     334  169 139  1.17    1.70   >30                                      171     346  221 168  2.21    1.62   >30                                      172     368  249 189  1.30    1.03    27                                      173     336  170 141  1.20    1.67   >30                                      174     357  229 173  1.98    1.50   >30                                      175     394  270 214  1.28    1.00    27                                      176     348  219 149  1.62    1.36   >30                                      177     378  250 171  1.46    1.18    30                                      178     428  283 257  1.10    0.98    21                                      179     348  224 170  2.03    1.70   >30                                      180     357  231 174  1.92    1.31   >30                                      181     358  234 176  1.96    1.26   >30                                      182     352  227 172  2.03    1.42   >30                                      183     361  231 178  1.43    1.04   >30                                      184     363  237 181  1.60    0.93   >30                                      185     351  226 152  1.70    1.21   >30                                      186     350  224 150  1.69    1.17   >30                                      187     354  229 158  1.53    1.00   >30                                      188     357  231 160  1.58    1.01   >30                                      189     359  233 178  1.98    1.60   >30                                      190     364  240 183  1.92    0.92   >30                                      COMPARA-                                                                      TIVE ALLOY                                                                    191     302  139 124  0.95    3.57   >30                                      192     421  276 230  0.61    0.73    15                                      193     300  127 105  0.37    2.67    12                                      194     394  208 182  0.58    1.38    15                                      195     360  236 148  0.68    2.59    12                                      196     306  136 124  2.08    1.22   >30                                      197     300  126  97  2.41    2.61   >30                                      198     367  201 190  0.64    1.42    15                                      199     301  138 114  2.71    2.73   >30                                      200     281  119 100  1.64    1.83   >30                                      201     413  267 225  0.37    0.84     6                                      202     284  120 107  1.59    1.72   >30                                      203     410  261 221  0.39    0.81     6                                      204     318  134 120  0.84    2.17   >30                                      205     412  271 219  0.60    0.87     9                                      206     311  130 113  0.98    2.34   >30                                      207     423  280 224  0.51    0.80     6                                      __________________________________________________________________________

EXAMPLE 4 C-Si-Mn-Cr-Fe-W-Mo-Co-Ti-Al-Ni ALLOY The alloys shown inEXAMPLE 4 are different from the content of the composition that thealloys include one to 8% by weight in comparison with alloys of EXAMPLE3. Alloys of this invention (Nos. 210 to 247), comparative alloys (Nos.248 to 265), and prior art alloys (Nos. 208 to 209) are shown thecomponent of the composition in TABLE 7-1, TABLE 7-2, and TABLE 7-3. Theproperties of alloys are shown in TABLE 8-1 and TABLE 8-2.

No. 214 alloy consists essentially of 0.96% by weight of carbon, 1.67%of silicon. 0.66% of manganese, 15.13% of chromium, 18.01% of iron,3.04% of cobalt, 5.14% of tungsten, 3.08% of molybdenum, 1.22% oftitanium, 0.12% of aluminium, and the balance nickel (% refers topercent by weight).

Furthermore, alloys of Nos. 235 to 247 include optionally at least oneselected from the group consisting of 0.005 to 0.2% of nitrogen, 0.01 to1.5% of niobium and tantalum, and 0.001 to 0.2% of boron and zirconium.

The properties of Nos. 208 to 265 alloys are shown in TABLE 8-1 andTABLE 8-2 similar to EXAMPLE 1.

For example, No. 214 alloy is shown 352 of Vickers hardness at roomtemperature, 173 at 900° C., 157 at 1000° C. and 1.70 kg-m/cm² of Charpyimpact strength at room temperature 1.77×10⁻⁷ of the amount of thespecific wear, and >30 of the number of the cycle till the occurrence ofthe crack.

No. 214 in EXAMPLE 4 include, 3.04% by weight of cobalt in comparisonwith alloy having similar composition of No. 157 in EXAMPLE 3. No. 157alloy is shown 349 of Vickers hardness at room temperature, 169 at 900°C., 154 at 1000° C. Furthermore No. 157 alloy shows 1.74 kg-m/cm² ofCharpy impact strength at room temperature, 1.80×10⁻⁷ of the amount ofthe specific wear, >30 of the number of the cycle till the occurrence ofthe crack. The component of the composition and its properties are shownin TABLE 7-1, TABLE 7-2, TABLE 7-3 and TABLE 8-1, TABLE 8-2,respectively.

    TABLE 7      COMPONENT OF COMPOSITION (% by weight) C Si Mn Cr Fe W Mo Co Ti Al N Nb T     a B Zr Cu V Ni       Prior art alloy                   208 1.32 1.59 2.00 25.89 bal. --     0.50 -- -- -- -- -- -- -- -- -- 0.18 11.04 209 1.28 0.83 0.76 33.92     17.89 3.06 2.98 -- -- -- -- -- -- -- -- 4.98 -- bal. ALLOY OF THIS     INVENTION 210 0.56 0.87 0.70 20.20 27.03 4.89 5.10 4.89 1.51 0.08 -- --     -- -- -- -- -- bal. 211 1.21 0.84 0.68 20.19 27.10 5.01 5.09 4.98 1.49     0.07 -- -- -- -- -- -- -- bal. 212 1.97 0.79 0.69 20.23 27.08 4.97 5.04     4.95 1.47 0.05 -- -- -- -- -- -- -- bal. 213 0.99 0.11 0.68 15.18 18.09     5.16 3.07 3.01 1.25 0.11 -- -- -- -- -- -- -- bal. 214 0.96 1.67 0.66     15.13 18.01 5.14 3.08 3.04 1.22 0.12 -- -- -- -- -- -- -- bal. 215 0.94     2.97 0.68 15.16 18.06 5.13 3.10 3.02 1.21 0.10 -- -- -- -- -- -- -- bal.     216 0.98 0.66 0.11 24.98 7.85 6.71 3.19 4.54 0.12 1.01 -- -- -- -- -- --     -- bal. 217 0.99 0.69 1.60 25.04 7.89 6.76 3.24 4.55 0.14 1.02 -- -- --     -- -- -- -- bal. 218 0.97 0.67 2.96 25.01 7.86 6.78 3.21 4.54 0.10 1.04     -- -- -- -- -- -- -- bal. 219 0.85 0.72 0.74 10.32 18.04 5.93 4.57 2.03     1.57 0.05 --  -- -- -- -- -- -- bal. 220 0.87 0.71 0.70 27.01 17.96 5.96     4.66 2.01 1.58 0.01 -- -- -- -- -- -- -- bal. 221 1.03 0.67 0.79 20.16     3.09 8.92 2.02 5.06 0.03 1.49 -- -- -- -- -- -- -- bal. 222 1.04 0.72     0.81 20.23 29.54 8.97 2.05 5.07 0.06 1.51 -- -- -- -- -- -- -- bal. 223     0.98 0.65 0.84 15.44 17.90 0.51 8.70 4.06 0.56 0.52 -- -- -- -- -- -- --     bal. 224 0.96 0.69 0.81 15.50 17.73 9.95 2.17 4.02 0.55 0.51 -- -- -- --     -- -- -- bal. 225 1.01 0.61 0.78 15.49 17.90 8.76 0.52 4.04 0.52 0.55 --     -- -- -- -- -- -- bal. 226 1.05 0.62 0.81 15.56 17.96 2.01 9.94 4.05     0.50 0.51 -- -- -- -- -- -- -- bal. 227 1.31 0.72 0.80 25.93 17.95 5.16     5.02 1.03 0.48 0.54 -- -- -- -- -- -- -- bal. 228 1.27 0.70 0.78 25.97     17.98 5.14 5.00 7.86 0.50 0.51 -- -- -- -- -- -- -- bal. 229 0.89 0.67     0.77 20.08 18.03 6.01 3.09 1.52 0.012 2.52 -- -- -- -- -- -- -- bal. 230     0.90 0.70 0.76 20.06 18.07 6.08 3.14 1.50 1.96 1.06 -- -- -- -- -- -- --     bal. 231 0.92 0.69 0.78 20.07 18.02 6.03 3.06 1.54 3.47 0.05 -- -- -- --     -- -- -- bal. 232 0.90 0.68 0.83 19.98 18.04 5.08 4.07 2.06 3.08 0.011     -- -- -- -- -- -- -- bal. 233 0.92 0.70 0.79 19.99 18.07 5.11 4.03 2.03     0.98 1.99 -- -- -- -- -- -- -- bal. 234 0.90 0.68 0.80 19.86 18.08 5.10     4.10 2.05 0.06 3.48 -- -- -- -- --  -- -- bal. 235 1.20 0.72 0.79 15.04     10.09 5.04 4.97 2.00 0.58 0.10 0.0053 -- -- -- -- -- -- bal. 236 1.19     0.69 0.81 15.06 10.10 5.03 4.98 1.99 0.59 0.09 0.105 -- -- -- -- -- --     bal. 237 1.17 0.70 0.80 15.05 10.06 5.04 4.93 1.98 0.60 0.11 0.196 -- --     -- -- -- -- bal. 238 0.94 0.74 0.79 20.03 18.04 6.07 3.06 2.50 2.00 0.97     -- 1.41  -- -- -- -- -- bal. 239 0.96 0.69 0.81 20.09 18.07 6.10 3.09     2.53 1.97 0.98 -- -- 0.013 -- -- -- -- bal. 240 0.91 0.68 0.77 20.12     18.05 6.08 3.05 2.51 1.99 0.94 -- 0.412 0.405 -- -- -- -- bal. 241 0.93     0.70 0.81 20.01 18.06 5.07 4.08 1.99 0.91 1.98 -- -- -- 0.197 -- -- --     bal. 242 0.96 0.68 0.79 20.14 18.13 5.11 4.16 2.06 1.09 2.06 -- -- -- --      0.0013 -- -- bal. 243 0.98 0.69 0.81 20.16 18.10 5.07 4.14 2.01 1.04     2.04 -- -- -- 0.050 0.052 -- -- bal. 244 1.09 0.70 0.79 15.10 9.99 5.12     5.03 2.04 0.62 0.22 0.093 -- 0.612 -- -- -- -- bal. 245 1.08 0.74 0.82     15.16 10.01 5.19 4.99 2.01 0.64 0.19 0.069 -- -- -- 0.098 -- -- bal. 246     0.93 0.70 0.79 20.06 18.07 6.03 3.14 2.49 1.98 0.95 -- 0.531 0.412 0.075     -- -- -- bal. 247 0.94 0.62 0.74 20.04 18.01 6.05 3.10 2.52 1.99 0.90     0.082 0.393 0.402 0.061 0.052 -- -- bal. COMPARA- ALLOY 248 0.48* 0.83     0.67 20.11 26.99 4.91 4.97 5.00 1.50 0.05 -- -- -- -- -- -- -- bal. 249     2.09* 0.84 0.69 20.08 26.97 4.96 4.98 5.01 1.54 0.05 -- -- -- -- -- --     -- bal. 250 1.03 --* 0.68 15.20 18.07 5.16 3.05 3.00 1.23 0.13 -- -- --     -- -- -- -- bal. 251 1.02 3.18* 0.70 15.24 18.04 5.19 3.05 3.01 1.20     0.12 -- -- -- -- -- -- -- bal. 252 1.01 0.69 --* 25.02 8.00 6.84 3.20     4.53 0.15 1.04 -- -- -- -- -- -- -- bal. 253 1.02 0.71 3.11* 25.06 8.03     6.82 3.17 4.51 0.12 1.01 -- -- -- -- -- -- -- bal. 254 0.87 0.70 0.73     9.05* 18.05 5.94 4.60 2.01 1.56 0.07 -- -- -- -- -- -- -- bal. 255 0.88     0.71 0.69 30.52* 18.04 5.96 4.67 1.99 1.59 0.06 -- -- -- -- -- -- --     bal. 256 1.05 0.69 0.82 20.18 31.53* 9.03 2.02 5.00 0.05 1.53 -- -- --     -- -- -- -- bal. 257 0.98 0.72 0.77 15.49 18.04 --* 8.96 4.05 0.54 0.50     -- -- -- -- -- -- -- bal. 258 1.01 0.66 0.79 15.54 17.81 11.01* 8.98     4.03 0.57 0.53 -- -- -- -- -- -- -- bal. 259 1.04 0.60 0.83 15.51 18.01     8.88 --* 4.01 0.50 0.54 -- -- -- -- -- -- -- bal. 260 1.03 0.63 0.81     15.54 17.98 2.04 10.51* 4.03 0.54 0.52 -- -- -- -- -- -- -- bal. 261     1.30 0.69 0.82 25.96 17.97 5.13 5.01 --* 0.53 0.52 -- -- -- -- -- -- --     bal. 262 0.94 0.70 0.77 20.04 18.06 6.05 3.15 1.51 --* 2.54 -- -- -- --     -- -- -- bal. 263 0.93 0.72 0.79 20.06 18.02 6.04 3.08 1.54 3.59* 0.07     -- -- -- -- -- -- -- bal. 264 0.96 0.68 0.76 20.04 18.13 5.12 4.09 2.01     3.04 --* -- -- -- -- -- -- -- bal. 265 0.91 0.67 0.77 20.06 18.07 5.16     4.07 2.04 0.07 3.58* -- -- --  -- -- -- -- bal.

                                      TABLE 8                                     __________________________________________________________________________            VICKERS HARDNESS                                                                            Charpy impact                                                                         Amount Number cycle                                     at room       strength                                                                              specific                                                                             till occurrence                                  temp.                                                                              900° C.                                                                    1000° C.                                                                    kg -m/cm.sup.2                                                                        wear × 10.sup.-7                                                               of crack                                 __________________________________________________________________________    Prior art alloy                                                               208     259   77  64  0.89    3.28    18                                      209     305  143 130  0.43    1.97     3                                      ALLOY                                                                         OF THIS                                                                       INVENTION                                                                     210     324  166 154  1.81    1.87   >30                                      211     345  186 162  1.74    1.70   >30                                      212     394  263 197  1.03    0.97    30                                      213     330  157 153  1.73    1.91   >30                                      214     352  173 157  1.70    1.77   >30                                      215     380  179 165  1.20    1.36    30                                      216     350  170 156  1.76    1.72   >30                                      217     349  169 152  1.84    1.51   >30                                      218     329  157 144  1.93    1.44   >30                                      219     337  161 148  2.10    1.50   >30                                      220     366  201 189  1.42    1.12    30                                      221     354  193 167  1.82    1.70   >30                                      222     329  157 146  2.60    1.93   >30                                      223     374  239 182  1.30    1.24   >30                                      224     393  261 211  1.21    0.89    27                                      225     371  237 181  1.29    1.28   >30                                      226     390  257 208  1.26    0.92    27                                      227     336  171 147  1.93    1.86   >30                                      228     355  193 180  2.05    1.32   >30                                      229     338  173 148  1.04    1.64   >30                                      230     353  226 172  2.16    1.47   >30                                      231     374  254 196  1.27    1.00    27                                      232     340  177 152  1.18    1.60   >30                                      233     364  236 179  1.90    1.42   >30                                      234     401  276 219  1.20    0.97    27                                      235     355  224 158  1.50    1.24   >30                                      236     386  257 175  1.40    1.03    30                                      237     439  296 269  1.00    0.82    21                                      238     361  237 180  1.90    1.30   >30                                      239     354  230 171  1.84    1.61   >30                                      240     363  234 179  1.48    1.00   >30                                      241     368  239 184  1.61    0.94   >30                                      242     356  227 155  1.82    1.17   >30                                      243     358  230 157  1.71    1.09   >30                                      244     389  260 168  1.42    0.97   >30                                      245     361  239 163  1.60    1.00   >30                                      246     363  242 182  1.84    1.42   >30                                      247     371  253 189  1.87    0.92   >30                                      COMPARA-                                                                      TIVE ALLOY                                                                    248     304  141 127  0.92    3.49    30                                      249     428  281 235  0.54    0.69    12                                      250     305  131 113  0.40    2.59    12                                      251     400  219 189  0.64    1.30    15                                      252     365  242 153  0.73    2.48    12                                      253     310  140 127  2.03    1.15   >30                                      254     301  130 101  2.37    2.54   >30                                      255     374  214 197  0.60    1.30    15                                      256     305  140 121  2.63    2.60   >30                                      257     286  127 109  1.57    1.66   >30                                      258     420  278 231  0.31    0.78     6                                      259     289  138 114  1.52    1.53   >30                                      260     417  274 229  0.32    0.80     6                                      261     310  139 124  2.13    2.07   >30                                      262     325  138 126  0.80    2.08   >30                                      263     419  284 227  0.55    0.82     9                                      264     316  137 119  0.94    2.29   >30                                      265     427  288 236  0.49    0.76     6                                      __________________________________________________________________________

ABILITY OF INDUSTRIAL UTILITY

The alloy of this invention are employed for the guide shoe included thepierced billet used in a hot rolling apparatus for fabricating seamlesssteel pipe due to improve in the thermal and wear resistance, toughnessat elevated temperatures.

The alloy of this invention have the industrial utilizable propertiesand the extremely long life and the stability. Furthermore, the alloyaccording to this invention is applied widely to employing for thebuild-up weld.

We claim:
 1. The thermal and wear resistant, tough nickel based alloy atelevated temperatures consisting essentially of 0.55 to 2.0% by weightof carbon, 10 to 28% by weight of chromium, 1 to 30% by weight of iron,0.01 to 4.5% by weight of titanium, 0.01 to 4.5% by weight of aluminum,0.1 to 10% by weight of tungsten, 0.1 to 10% by weight of molybdenum,0.1 to 3% by weight of silicon, 0.1 to 3% by weight of manganese and thebalance nickel and incidental impurities.
 2. The alloy as defined inclaim 1, wherein further said alloy is included 0.005 to 0.2% by weightof nitrogen.
 3. The alloy as defined in claim 1, wherein further saidalloy are included at least one selected from the group consisting of0.01 to 1.5% by weight of niobium and tantalum.
 4. The alloy as definedin claim 1, wherein further said alloy are included at least oneselected from the group consisting of 0.001 to 0.2% by weight of boronand zirconium.
 5. The alloy as defined in claim 2, wherein further saidalloy are included at least one selected from the group consisting of0.01 to 1.5% by weight of niobium and tantalum.
 6. The alloy as definedin claim 2, wherein further said alloy are included at least oneselected from the group consisting of 0.001 to 0.2% by weight of boronand zirconium.
 7. The alloy as defined in claim 3, wherein further saidalloy are included at least one selected from the group consisting of0.001 to 0.2% by weight of boron and zirconium.
 8. The alloy as definedin claim 5, wherein further said alloy are included at least oneselected from the group consisting of 0.001 to 0.2% by weight of boronand zirconium.
 9. The thermal and wear resistant, tough nickel basedalloy at elevated temperatures consisting essentially of 0.55 to 2.0% byweight of carbon, 10 to 28% by weight of chromium, 1 to 30% by weight ofiron, 0.01 to 4.5% by weight of titanium, 0.01 to 4.5% by weight ofaluminium, 0.1 to 10% by weight of tungsten, 0.1 to 10% by weight ofmolybdenum, 0.1 to 3% by weight of silicon, 0.1 to 3% by weight ofmanganese, 1 to 8% by weight of cobalt and the balance nickel andincidental impurities.
 10. The alloy as defined in claim 9, whereinfurther said alloy is included 0.005 to 0.2% by weight of nitrogen. 11.The alloy as defined in claim 9, wherein further said alloy are includedat least one selected from the group consisting of 0.01 to 1.5% byweight of niobium and tantalum.
 12. The alloy as defined in claim 9,wherein further said alloy are included at least one selected from thegroup consisting of 0.001 to 0.2% by weight of boron and zirconium. 13.The alloy as defined in claim 10, wherein further said alloy areincluded at least one selected from the group consisting of 0.01 to 1.5%by weight of niobium and tantalum.
 14. The alloy as defined in claim 10,wherein further said alloy are included at least one selected from thegroup consisting of 0.001 to 0.2% by weight of boron and zirconium. 15.The alloy as defined in claim 11, wherein further said alloy areincluded at least one selected the group consisting of 0.001 to 0.2% byweight of boron and zirconium.
 16. The alloy as defined in claim 13,wherein further said alloy are included at least one selected from thegroup consisting of 0.001 to 0.2% by weight of boron and zirconium.